Method for indicating reference signal configuration information, base station, and terminal

ABSTRACT

Provided are a method for indicating reference signal configuration information, a base station and a terminal. The method includes that a first communication node determines joint signaling and the first communication node transmits the joint signaling to a second communication node. The joint signaling includes first information and second information. The first information includes at least one of the following: quasi-colocation configuration information and configuration information of a transmission beam. The second information includes at least one of the following: configuration information of a phase tracking reference signal and configuration information of a demodulation reference signal.

CROSS-REFERENCE TO RELATED APPLICATIONS

The present application is a continuation of U.S. patent applicationSer. No. 17/933,413, filed on Sep. 19, 2022, which is a continuation ofU.S. patent application Ser. No. 16/782,055 filed on Feb. 4, 2020, nowU.S. Pat. No. 11,451,414, which is a continuation of InternationalApplication No. PCT/CN2018/097244 filed on Jul. 26, 2018, which is basedon and claims priority to a Chinese patent application No.201710677499.3 filed on Aug. 9, 2017, the disclosures of which areincorporated herein by reference in their entireties.

TECHNICAL FIELD

The present application relates to, but is not limited to, the field ofcommunications and, in particular, relates to a method for indicatingreference signal configuration information, a base station and aterminal.

BACKGROUND

In the related art, it is necessary to introduce a phase noise trackingreference signal (PTRS) to estimate phase noises at high frequencies.Generally, one antenna panel of one transmission receiver point (TRP)uses one crystal oscillator, so multiple Demodulation reference signals(DMRS) ports from the one antenna panel may share one PTRS port, thatis, estimation results of the PTRS port may be used for the multipleDMRS ports from the one antenna panel. If multiple panels of one TRPshare one crystal oscillator, then all DMRS ports from the one TRP mayshare one PTRS port. However, at present, there is no consensus on howto know the number of the PTRS ports and how to notify the user of thenumber of PTRS ports. Semi-static notification of the number of PTRSports is not flexible, while flexible notification of Downlink ControlInformation (DCI) requires the physical layer signaling overhead. Inaddition, there is also no consensus on how to configure the type andthe symbol quantity of the front loaded reference signal. Thesemi-static configuration of the high layer signaling will have problemsin multi-cell transmission, while the flexible notification of DCIrequires the physical layer signaling overhead.

At present, a New Radio (NR) physical layer technology is under a heateddiscussion in the Radio Access Network (RAN) 1 of the 3rd GenerationPartnership Project (3GPP). Flexibility and efficiency have always beenthe goal pursued by the NR physical layer design. Also, pursuing for themaximum flexibility of a physical layer reference signal also seems tobe a trend. This is because requirements for demodulating referencesignals may be different for different application scenarios. Inaddition, the NR supports to transmit data at high frequencies, so amulti-antenna beamforming technology is necessary for compensating ahuge path loss and other losses at high frequencies, such as theattenuation caused by rain or plant absorption. The beamformingtechnology at high frequencies may be divided into a digitalbeamforming, an analogue beamforming and a hybrid digital-and-analoguebeamforming. In the digital beamforming technology, the transmitting endneeds to know relatively well about the channel state, that is, knowchannel information of each antenna port, so huge reference signaloverhead becomes a problem. Therefore the analogue beamforming hasreceived wide attention. The beamforming method may be implemented on atransmitting end, and may also be implemented on a receiving end. Forexample, the base station may transmit data to the user by usingdifferent transmission beams and the user may also receive the data byusing different receiving beams.

In a Long Term Evolution (LTE), a Quasi-colocation (QCL) parameter setmainly includes an average gain, a delay spread, a Doppler spread, aDoppler shift and an average delay. When performing a multi-TRPtransmission, the base station needs to notify the user of a referencesignal quasi co-located with the DMRS of the user and PDSCH mappingparameters. In this way, the user may demodulate the data by using QCLparameter information of a configured reference signal.

However, in the related art, notifying the user of the reference signalinformation causes additional physical layer overhead, thereby causingthe problem of huge signaling and physical layer overhead.

SUMMARY

Embodiments of the present application provide a method for indicatingreference signal configuration information, a base station and aterminal.

The method for indicating reference signal information provided by anembodiment of the present application includes: determining jointsignaling, and transmitting the joint signaling. The joint signaling isused for indicating the reference signal configuration information. Thejoint signaling includes first information and second information. Thefirst information includes at least one of: quasi-colocationconfiguration information and configuration information of atransmission beam. The second information includes at least one of:configuration information of a phase tracking reference signal andconfiguration information of a demodulation reference signal.

A method for indicating reference signal information provided by anotherembodiment of the present application includes: receiving jointsignaling, and performing, according to the joint signaling, datatransmission with a communication node transmitting the joint signaling.The joint signaling includes first information and second information.The first information includes at least one of: quasi-colocationconfiguration information and configuration information of atransmission beam; the second information includes at least one of thefollowing: configuration information of a phase tracking referencesignal and configuration information of a demodulation reference signal.The joint signaling is used for indicating reference signalconfiguration information.

A base station is provided by another embodiment of the presentapplication, and the base station includes: a first processor, which isconfigured to determine joint signaling, where the joint signalingincludes first information and second information, the first informationincludes at least one of: quasi-colocation configuration information andconfiguration information of a transmission beam, the second informationincludes at least one of: configuration information of a phase trackingreference signal and configuration information of a demodulationreference signal; and a first communication device, which is used fortransmitting the joint signaling to a second communication node.

A terminal is provided by another embodiment of the present application,and the terminal includes: a second communication device, which isconfigured to receive joint signaling transmitted by a firstcommunication, where the joint signaling includes first information andsecond information, the first information includes at least one of:quasi-colocation configuration information and configuration informationof a transmission beam, and the second information includes at least oneof: configuration information of a phase tracking reference signal andconfiguration information of a demodulation reference signal; and asecond processor, which is configured to receive, according to the jointsignaling, data transmitted by a first communication node, and/orperform data transmission with the first communication node.

A device for indicating reference signal information is provided byanother embodiment of the present application. The device is applied toa first communication node and includes: a determining module, which isconfigured to determine joint signaling, where the joint signalingincludes first information and second information, the first informationincludes at least one of: quasi-colocation configuration information andconfiguration information of a transmission beam, and the secondinformation includes at least one of: configuration information of aphase tracking reference signal and configuration information of ademodulation reference signal; and a transmitting module, which isconfigured to transmit the joint signaling to a second communicationnode.

A device for indicating reference signal information is provided byanother embodiment of the present application. The device is applied toa second communication node and includes a receiving module, which isconfigured to receive joint signaling transmitted by a firstcommunication, where the joint signaling includes first information andsecond information, the first information includes at least one of:quasi-colocation configuration information and configuration informationof a transmission beam, and the second information includes at least oneof: configuration information of a phase tracking reference signal andconfiguration information of a demodulation reference signal; and atransmission module, which is configured to receive, according to thejoint signaling, data transmitted by a first communication node, and/orperform data transmission with the first communication node.

A storage medium is provided by another embodiment of the presentapplication. The storage medium includes programs stored therein. Whenexecuted, the programs execute the method of any one of the embodimentsdescribed above.

A processor is provided by another embodiment of the presentapplication. The processor is used for executing programs. Whenexecuted, the programs execute the method of any one of the embodimentsdescribed above.

In this application, a first communication node determines jointsignaling, where the joint signaling includes first information andsecond information; where the first information includes at least oneof: quasi-colocation configuration information and configurationinformation of a transmission beam, and the second information includesat least one of: configuration information of a phase tracking referencesignal and configuration information of a demodulation reference signal;and the first communication node transmits the joint signaling to asecond communication node. With the above technical solutions, the jointsignaling solves the problem of huge physical layer overhead andsignaling overhead caused by notifying the user of reference signalinformation in the related art. In a case of guaranteeing that the userterminal is accurately notified of the reference signal information, thejoint signaling reduces the physical layer overhead and signalingoverhead.

BRIEF DESCRIPTION OF DRAWINGS

The drawings described herein are used to provide a furtherunderstanding of the present application and form a part of the presentapplication. The exemplary embodiments and descriptions thereof in thepresent application are used to explain the present application and notto limit the present application in any improper way. In the drawings:

FIG. 1 is a block diagram illustrating the hardware construction of amobile terminal of a method for indicating reference signal informationaccording to an embodiment of the present application;

FIG. 2 is a flowchart of a method for indicating reference signalinformation according to an embodiment of the present application;

FIG. 3 is a schematic diagram 1 of a demodulation reference signal type2 according to the example 1;

FIG. 4 is a schematic diagram 2 of a demodulation reference signal type2 according to the example 1;

FIG. 5 is a schematic diagram of multiple DMRS port groups sharing oneoscillator according to the example 1;

FIG. 6 is a schematic diagram 1 of a demodulation reference signal type1 according to the example 1a;

FIG. 7 is a schematic diagram 2 of a demodulation reference signal type1 according to the example 1a;

FIG. 8 is a schematic diagram of multipoint dynamic switchingtransmission according to the example 2;

FIG. 9 is a diagram illustrating the hardware construction of a basestation according to an embodiment of the present application; and

FIG. 10 is a diagram illustrating the hardware construction of aterminal according to an embodiment of the present application.

DETAILED DESCRIPTION

An embodiment of the present application provides a mobile communicationnetwork (which includes, but is not limited to a 5G mobile communicationnetwork). The network architecture of this network may include anetwork-side device (such as a base station) and a terminal. Aninformation transmission method executed on the network architecture isprovided by the embodiment. It should be noted that the executionenvironment of the information transmission method provided by theembodiment of the present application is not limited to the abovenetwork architecture. It should be noted that in this presentapplication, a first communication node may be the network-side device,such as the base station and a second communication node may be theterminal. Other cases are not excluded of course, for example, the firstcommunication node generally refers to a user and the secondcommunication node also generally refers to the user, and the method maybe applied to a Device to Device (D2D) communication.

A method embodiment provided by one embodiment of the presentapplication may be executed in a mobile terminal, a computer terminal orother similar computing devices. The description below takes the methodexecuted on the mobile terminal as an example. FIG. 1 is a block diagramillustrating the hardware construction of a mobile terminal of a methodfor indicating reference signal information according to an embodimentof the present application. As shown in FIG. 1 , the mobile terminal 10may include one or more (only one is shown in FIG. 1 ) processors 102(the processor 102 may include, but is not limited to, a microprocessor(MCU), a programmable logic device such as FPGA or other processingdevices), a memory 104 configured to store data, and a communicationdevice 106 for implementing a communication function. It will beunderstood by those skilled in the art that the structure shown in FIG.1 is merely illustrative, and not intended to limit the structure of theelectronic device described above. For example, the mobile terminal 10may further include more or fewer components than that shown in FIG. 1or may have a configuration different from the configuration shown inFIG. 1 .

The memory 104 may be configured to store software programs and modulesof application software, such as program instructions/modulescorresponding to the method for indicating the reference signalinformation in the embodiment of the present application. The processors102 execute the software programs and modules stored in the memory 104to perform various functional applications and data processing, that is,to implement the method described above. The memory 104 may include ahigh-speed random access memory, and may further include a nonvolatilememory, such as one or more magnetic storage devices, flash memories orother nonvolatile solid-state memories. In some examples, the memory 104may further include memories that are remotely disposed with respect tothe processors 102. These remote memories may be connected to the mobileterminal 10 via a network. Examples of such a network include, but arenot limited to, the Internet, intranets, local area networks, mobilecommunication networks, and combinations thereof.

The communication device 106 is configured to receive or transmit datavia a network. Specific examples of such a network described above mayinclude a wireless network provided by a communication provider of themobile terminal 10. In one example, the communication device 106includes a Network Interface Controller (NIC), which may be connected toother network devices via a base station and thus be capable ofcommunicating with the Internet. In one example, the communication 106may be a Radio Frequency (RF) module, which is used for communicatingwith the Internet in a wireless way.

In the Long Term Evolution (LTE), the base station configures, throughhigher layer signaling, a PQI (data channel mapping and QCL indicationinformation) to be similar to an information configuration in table7.1.9-1 of LTE standard 36.213. As described in the standard 36.213,generally, the base station configures, by higher signaling, multiplesets of parameters (such as four sets) for indicating a PhysicalDownlink Shared Channel (PDSCH) RE Mapping and Quasi-Co-LocationIndicator. In standard 36.212, as described in DCI format 2D, the basestation indicates which is configured by higher layer signaling by usingseveral bits signaling, such as 2 bits. If it is a dynamical pointselection (DPS) scheduling, the multiple sets of PQI parameters maycorrespond to different TRP transmissions.

Since effects of data demodulation with different receiving beams athigh frequencies are different, the base station needs to indicate theuser the receiving beam used for receiving data. Or the base stationindicates, by using a QCL parameter, the user that a certain referencesignal transmitted before is used for receiving a beam indication, thatis, the user uses the receiving beam of the reference signal indicatedby the base station to receive when receiving the data or the DMRS.Since this reference signal has been transmitted before, and usuallytransmitted cyclically for a beam management, the user has already beenknown the best receiving beam used by receiving this reference signal.

So, in the NR, a parameter, namely spatial Rx parameters, used forreceiving the beam indication is added in the QCL parameter set. So, theQCL parameter set in the NR includes an average gain, a delay spread, aDoppler spread, a Doppler shift, an average delay and spatial Rxparameters. The spatial Rx parameters may include one or more referencesignals.

Similar to the LTE, the NR also supports the multi-TRP transmission,that is, a coordinated multiple points Transmission/Reception (CoMP).The CoMP technology includes multiple transmission schemes, such as adynamical point selection (DPS) and a joint transmission (JT). Sincedifferent TRPs or transmission beams may have totally different orpartially different QCL parameters, when performing the JT, if differentDMRS ports from different TRPs, the QCL parameters of these DMRS portsmay be different.

In addition, a phase noise tracking RS (PTRS) may be necessary toestimate phase noises at high frequencies. This is because at highfrequencies, the phase noises greatly reduce of the estimation accuracyof the demodulation reference signal on a time domain, thereby reducingthe system transmission efficiency. Generally, since one antenna panelof one TRP uses one oscillator, then multiple DMRS ports of the oneantenna panel may share one PTRS port, that is, the PTRS port estimationresult may be used for the multiple DMRS ports of the one antenna panel.If multiple panels of one TRP share one oscillator, then all DMRS portsof the one TRP may share one PTRS port. A user device is notified of theshared PTRS port of the DMRS ports, which may reduce the signalingoverhead and physical layer resource overhead as much as possible. Inview of this, this embodiment provides a method for indicating thereference signal information executed on the network architecturedescribed above. FIG. 2 is a flowchart of a method for indicatingreference signal information according to an embodiment of the presentapplication. As shown in FIG. 2 , the process includes steps describedbelow.

In step S202, the first communication node determines joint signaling.The joint signaling includes first information and second information.The first information includes at least one of: quasi-colocationconfiguration information and configuration information of atransmission beam. The second information includes at least one of:configuration information of a phase tracking reference signal andconfiguration information of a demodulation reference signal.

In step S204, the first communication node transmits the joint signalingto the second communication node.

In the steps described above, the first communication node determinesthe joint signaling. The joint signaling includes the first informationand the second information. The first information includes at least oneof: the quasi-colocation configuration information and the transmissionbeam configuration information. The second information includes at leastone of: the configuration information of the phase tracking referencesignal and the configuration information of the demodulation referencesignal. The first communication node transmits the joint signaling tothe second communication node. With the above technical solutions, thejoint signaling solves the problem of additional physical layer overheadcaused by notifying the user of the reference signal information in therelated art. While guaranteeing that the user terminal is accuratelynotified of the reference signal information, the joint signalingreduces the physical layer overhead.

In some embodiments, the above steps may, but are not limited to, beexecuted by the base station.

In some embodiments, the configuration information of the demodulationreference signal includes at least one of: a number of symbols of thedemodulation reference signal, a type of the demodulation referencesignal, a code division type of the demodulation reference signal, anorder of the demodulation reference signal ports, and port mappinginformation of the demodulation reference signal.

In some embodiments, the quasi-colocation configuration informationincludes one or more quasi-colocation parameter subsets, thedemodulation reference signal ports includes one or more type 1 portgroups of the demodulation reference signal, where each of the one ormore quasi-colocation parameter subsets corresponds to a respective oneof the one or more type 1 port groups of the demodulation referencesignal.

In some embodiments, the first communication node also configures,through higher layer signaling, at least one of the followinginformation for the second communication node: a maximum number of thequasi-colocation parameter subsets; and a maximum number of the type 1port groups of the demodulation reference signal.

In some embodiments, the configuration information of the phase trackingreference signal includes at least one of: a number of phase trackingreference signal ports, one or more port identifiers of the phasetracking reference signal and a maximum number of phase trackingreference signal ports.

In some embodiments, in a case where the quasi-colocation configurationinformation includes one or more quasi-colocation parameter subsets, thefirst communication node transmits the joint signaling to the secondcommunication node, the joint signaling includes the one or morequasi-colocation parameter subsets and one or more port identifiers ofphase tracking reference signal, where each of the one or morequasi-colocation parameter subsets corresponds to a respective one ofthe phase tracking reference signal ports.

In some embodiments, the maximum number of phase tracking referencesignal ports is equal to the maximum number of quasi-colocationparameter subsets.

In some embodiments, the first communication node indicates thefollowing information through the joint signaling: whether the type 1port groups of the demodulation reference signal share one phasetracking reference signal, or whether the port groups are quasico-located regarding a part of the quasi-colocation parameters.

In some embodiments, in a case where two type 1 port groups of thedemodulation reference signal are quasi co-located regarding thequasi-colocation parameters, the two type 1 port groups of thedemodulation reference signal share one phase tracking reference signal.The part of quasi-colocation parameters comprises a Doppler spread and aDoppler shift.

In some embodiments, one phase tracking reference signal corresponds toone type 2 port group of the demodulation reference signal, wherein thetype 2 port group of the demodulation reference signal includes one ormore type 1 port groups of the demodulation reference signal.

In some embodiments, the first communication node determines a codedivision type of the demodulation reference signal according to thenumber of quasi-colocation parameter subsets. All demodulation referencesignal ports in each code division group have same quasi-colocationparameters, and the quasi-colocation parameters of the demodulationreference signal ports in different code division groups are same ordifferent. The DMRS ports included in a code division group of codedivision group type 1 have same codes used on a time domain anddifferent codes used on a frequency domain. A code division group ofcode division group type 2 includes two code division groups of codedivision group type 1, and the demodulation reference signal portsincluded in the two code division groups of code division group type 1occupy same time frequency resources, and have different time domain OCCcodes.

In some embodiments, the first communication node and the secondcommunication node agree that a plurality of information indicatingstates of the demodulation reference signal include same demodulationreference signal ports, and orders of demodulation reference signalports indicated by the plurality of information indicating states aredifferent.

In some embodiments, different orders of demodulation reference signalports correspond to different quasi-colocation parameters.

In some embodiments, the first communication node determines that thesecond communication is provided with two quasi-colocation parametersets and six DMRS ports, and the six DMRS ports are mapped on only onetime domain symbol of the demodulation reference signal, alldemodulation reference signal ports of the first communication node usea first quasi-colocation parameter set of the two quasi-colocationparameter sets and do not use a second quasi-colocation parameter set ofthe two quasi-colocation parameter sets.

In some embodiments, the first communication node indicates at least oneof the following through the joint signaling: the configurationinformation of the transmission beam and the configuration informationof the phase tracking reference signal.

In some embodiments, the configuration information of the transmissionbeam includes at least one of: information indicating a soundingreference signal resource and a precoding information indication. Itshould be noted that the information indicating the sounding referencesignal resource includes an identifier for identifying the resource,that is, which resource of the sounding reference signal configured thistime is identified by this identifier. The identifier of the resourceinformation is similar to an index.

In some embodiments, the information indicating the sounding referencesignal resource includes port information of the phase trackingreference signal.

In some embodiments, one or more resources of the sounding referencesignal constitute a sounding reference signal resource set, eachsounding reference signal resource set corresponds to same portinformation of the phase tracking reference signal.

In some embodiments, resource configuration information of the soundingreference signal configured by higher layer signaling includes portidentifier of the phase tracking reference signal. The higher layersignaling here may include: radio resource control signaling or mediaaccess control signaling. The resource configuration information of thesounding reference signal carries the one or more port identifiers ofphase tracking reference signal.

A method for indicating reference signal information is provided byanother embodiment of the present application. The method is applied toa second communication node and includes the steps described below.

In step one, the second communication node receives joint signalingtransmitted by a first communication node. The joint signaling includesfirst information and second information. The first information includesat least one of: quasi-colocation configuration information andconfiguration information of a transmission beam. The second informationincludes at least one of: configuration information of a phase trackingreference signal and configuration information of a demodulationreference signal.

In step two, the second communication node receives, according to thejoint signaling, data transmitted by the first communication node,and/or performs data transmission with the first communication node.

In some embodiments, the configuration information of the demodulationreference signal includes at least one of: a number of symbols of thedemodulation reference signal, a type of the demodulation referencesignal, a code division type of the demodulation reference signal, anorder of the demodulation reference signal ports, and port mappinginformation the demodulation reference signal.

In some embodiments, the quasi-colocation configuration informationincludes one or more quasi-colocation parameter subsets. Thedemodulation reference signal ports include one or more type 1 portgroups of the demodulation reference signal. Each of the one or morequasi-colocation parameter subsets corresponds to a respective one ofthe one or more type 1 port groups of the demodulation reference signal.

In some embodiments, the second communication node receives at least oneof the following information configured by the first communication nodethrough higher layer signaling: a maximum number of the quasi-colocationparameter subsets; and a maximum number of the type 1 port groups of thedemodulation reference signal.

In some embodiments, the configuration information of the phase trackingreference signal includes at least one of: a number of phase trackingreference signal ports, one or more port identifiers of the phasetracking reference signal and a maximum number of the phase trackingreference signal ports.

In some embodiments, in a case where the quasi-colocation configurationinformation includes one or more quasi-colocation parameter subsets, thesecond communication node receives the joint signaling transmitted bythe first communication. The joint signaling includes the one or morequasi-colocation parameter subsets and one or more port identifiers ofthe phase tracking reference signal, where each of the one or morequasi-colocation parameter subsets corresponds to a respective one ofthe phase tracking reference signal ports.

In some embodiments, the maximum number of the phase tracking referencesignal ports is equal to the maximum number of the quasi-colocationparameter subsets.

In some embodiments, the second communication node receives thefollowing information notified by the joint signaling: whether the type1 port groups of the demodulation reference signal share one phasetracking reference signal, or whether the port groups are quasico-located regarding a part of the quasi-colocation parameters.

In some embodiments, in a case where two type 1 port groups of thedemodulation reference signal are quasi co-located regarding thequasi-colocation parameters, the two type 1 port groups of thedemodulation reference signal share one phase tracking reference signal;where the part of quasi-colocation parameters includes a Doppler spreadand a Doppler shift.

In some embodiments, one phase tracking reference signal corresponds toone type 2 port group of the demodulation reference signal, where thetype 2 port group of the demodulation reference signal includes one ormore type 1 port groups of the demodulation reference signal.

In some embodiments, the code division type of the demodulationreference signal is determined by the first communication node accordingto the number of quasi-colocation parameter subsets. All demodulationreference signal ports in each code division group have samequasi-colocation parameters, and the quasi-colocation parameters of thedemodulation reference signal ports in different code division groupsare same or different. The DMRS ports included in a code division groupof code division group type 1 have same codes used on a time domain anddifferent codes used on a frequency domain. The code division group ofcode division group type 2 includes two code division groups of codedivision group type 1, and the demodulation reference signal portsincluded in the two code division groups of code division group type 1occupy same time frequency resources and have different time domain OCCcodes.

In some embodiments, the second communication node and the firstcommunication node agree that a plurality of information indicatingstates of the configuration information of the demodulation referencesignal comprise same demodulation reference signal ports, and orders ofdemodulation reference signal ports indicated by the plurality ofinformation indicating states are different.

In some embodiments, different orders of demodulation reference signalports correspond to different quasi-colocation parameters.

In some embodiments, in a case where the second communication node isprovided with two quasi-colocation parameter sets and six DMRS ports,and the six DMRS ports are mapped on only one time domain symbol of thedemodulation reference signal, all demodulation reference signal portsof the first communication node use a first quasi-colocation parameterset of the two quasi-colocation parameter sets and do not use a secondquasi-colocation parameter set of the two quasi-colocation parametersets.

In some embodiments, the second communication node receives at least oneof the following information through the joint signaling: theconfiguration information of the transmission beam and the configurationinformation of the phase tracking reference signal.

In some embodiments, the configuration information of the transmissionbeam includes at least one of: information indicating a soundingreference signal resource and a precoding information indication.

In some embodiments, the information indicating the sounding referencesignal resource includes port information of the phase trackingreference signal.

In some embodiments, one or more resources of the sounding referencesignal constitute a sounding reference signal resource set, eachsounding reference signal resource set corresponds to same portinformation of the phase tracking reference signal.

The present application will be described below in detail in conjunctionwith examples.

Example of the DMRS Type 2

At present, for the design of the reference signal, a DMRS pattern basedon a Frequency domain orthogonal covering code (FD-OCC) is called theDMRS type 2. The DMRS type 2 may effectively support up to six ports inone DMRS symbol (as shown in FIG. 3 ) and support up to twelve ports intwo DMRS symbols (as shown in FIG. 4 ).

FIG. 3 is a schematic diagram 1 of the demodulation reference signaltype 2 according to the above embodiment. As shown in FIG. 3 , in oneResource block (RB), the abscissa is the time domain, and the ordinateis the frequency domain. Six DMRS ports are divided into three codedivision multiplexing (CDM) groups. A CDM group #0 includes a port p0and a port p1. In the CDM group #0, the port p0 and the port p1 aremapped onto the same time frequency resources through the OCC division.For example, the OCC used by the port p0 is [1 1], the OCC used by theport p1 is [1 −1]. In one RB, subcarriers mapped by the ports p0 and p1include subcarriers #4, #5, #10 and #11. Similarly, a CDM group #1includes a port p2 and a port p3. In the CDM group #1, the port p2 andthe port p3 are mapped onto the same time frequency resources throughthe OCC division. For example, the OCC used by the port p2 is [1 1], andthe OCC used by the port p3 is [1 −1]. A CDM group #2 includes a port p4and a port p5. In the CDM group #2, the port p4 and the port p5 aremapped onto the same time frequency resources through the OCC division.For example, the OCC used by the port p4 is [1 1], and the OCC used bythe port p5 is [1 −1]. The six DMRS ports may be allocated to one user,that is, a single-user MIMO (SU-MIMO), and may also be allocated tomultiple users, that is, a multi-user MIMO (MU-MIMO). The pattern in thefigure may support up to six DMRS ports, but the base station does notnecessarily allocate the 6 DMRS ports to the users when actuallyscheduling the users. For example, when a cell has a few users and thenumber of ports required by the users is small, the base station onlyneeds one or two ports. The ports here may be logic ports, andtransmitting one or two ports may be transmitting signals correspondingto the one or two ports, such as DMRSs.

A DMRS port group or a DMRS group, ports in which are quasi co-locatedregarding all quasi-colocation parameters, may be called a type 1 portgroup of the DMRS. It should be noted that the type 1 port group of theDMRS is a type 1 port group, and the type 1 port group may be used fortransmitting the DMRSs, and thus is called DMRS type port group. TheDMRSs transmitted by the type 1 port group of the DMRS may be the DMRStype 1 and/or the DMRS type 2. The DMRS type 1 and the DMRS type 2 bothare DMRS types, but are different DMRS types. The DMRS types and theport group types have no specific relationship.

For performing a code division demodulation easier, two DMRS ports inthe same CDM group have same parameters. In this way, when performing anintercode demodulation, the QCL of an interference port is the same withthe QCL of a target demodulation port, which is beneficial to anaccurate demodulation.

FIG. 4 is a schematic diagram 2 of the demodulation reference signaltype 2 according to example one. As shown in FIG. 4 , when thedemodulation reference signal has two DMRS symbols, up to twelve DMRSports may be supported. The twelve DMRS ports may be divided into threeCDM groups. A CDM group #0 includes a port p0, a port p1, a port p6 anda port p7. A CDM group #1 includes a port p2, a port p3, a port p8 and aport p9. A CDM group #2 includes a port p4, a port p5, a port p10 and aport p11. In the CDM group #0, the port p0, the port p1, the port p6 andthe port p7 occupy the same time frequency resources, but the timedomain OCCs or the frequency domain OCCs used are different. Forexample, the port p0 and the port p1 are distinguished by theirfrequency domain OCCs, but their time domain OCCs are the same, that is,the frequency domain OCC used by the port p0 is [1 1], the frequencydomain OCC used by the port p1 is [1 −1], but the port p0 and the portp1 use the same time domain OCC [1 1]. The p6 and the p7 aredistinguished by the frequency domain OCCs, but their time domain OCCsare the same, that is, the frequency domain OCC used by the port p6 is[1 1], the frequency domain OCC used by the port p7 is [1 −1], but theport p6 and the port p7 use the same time domain OCC [1 −1]. Similarly,four ports in each other CDM group are configured in the same manner. InCDM group #1, the port p2 and the port p3 use different frequency domainOCCs but same time domain OCC. The port p8 and the port p9 use differentfrequency domain OCCs but same time domain OCC. The time domain OCC usedby the port p2 and the port p3 is different from the time domain OCCused by the port p8 and the port p9. In CDM group #2, the port p4 andthe port p5 use different frequency domain OCCs but same time domainOCC. The port p10 and the port p11 use different frequency domain OCCsbut same time domain OCC. But the time domain OCC used by the port p4and the port p5 is different from the time domain OCC used by the portp10 and the port p11. This type of a CDM group is referred to as a CDMgroup type 2, that is, a code division group type 2.

For performing the code division demodulation easier, four DMRS ports inthe same CDM group may be configured to have same QCL parameters in apredefined manner. But the number of the CDM groups is limited up tothree.

In the present application, the ports p0-p11 are integers, and notnecessarily are continuous integers. For example, the ports p0-p11actually may represent ports 1000-1011.

Generally, at high frequencies, a NR base station may be provided withmultiple antenna panels. Each panel may transmit different analog beamswhich correspond to different demodulation reference signal ports. Ofcourse, one panel may also transmit one analog beam which correspondsmultiple digital beams. These digital beams correspond to different DMRSports. Since different beams transmitted by the multiple panelscorrespond to multiple DMRS ports, QCLs to which the multiple portscorrespond may be same or different.

In the multi-TRP transmission, and when each TRP has multiple panels, ifthe number of CDM groups is limited to three, then the number of theDMRS groups is limited to three, that is, up to three beam transmissionswith different QCL are supported, which may limit the scheduling.

For the pattern with two DMRS symbols, as shown in FIG. 4 , optionally,twelve DMRS ports may be divided into six CDM groups. A CDM group #0includes ports p0 and p1, and the port p0 and port p1 are distinguishedby different frequency domain OCCs. For example, the frequency domainOCC used by the port p0 is [1 1], the frequency domain OCC used by theport p1 is [1 −1]. A CDM group #1 includes ports p2 and p3, and the portp2 and port p3 are distinguished by different frequency domain OCCs. ACDM group #2 includes ports p4 and p5, and the port p4 and port p5 aredistinguished by different frequency domain OCCs. A CDM group #3includes ports p6 and p7, and the port p6 and port p7 are distinguishedby different frequency domain OCCs. A CDM group #4 includes ports p8 andp9, and the port p8 and port p9 are distinguished by different frequencydomain OCCs. A CDM group #5 includes ports p10 and p11, and the port p10and port p11 are distinguished by different frequency domain OCCs.Meanwhile, the ports in the CDM group #0 and the ports in the CDM group#3 occupy the same time frequency resources, but use different timedomain OCCs. For example, the time domain OCC used by the ports p0 andp1 in the CDM group #0 is [1 1], while the time domain OCC used by theports p6 and p7 in the CDM group #3 is [1 −1]. The ports in the CDMgroup #1 and the ports in the CDM group #4 occupy the same timefrequency resources, but use different time domain OCCs. For example,the time domain OCC used by the ports p2 and p3 in the CDM group #1 is[1 1], while the time domain OCC used by the ports p8 and p9 in the CDMgroup #4 is [1 −1]. The ports in the CDM group #2 and the ports in theCDM group #5 occupy the same time frequency resources, but use differenttime domain OCCs. For example, the time domain OCC used by the ports p4and p5 in the CDM group #2 is [1 1], while the time domain OCC used bythe ports p10 and p11 in the CDM group #5 is [1 −1]. Similarly, all DMRSports in each CDM group have same QCL parameters, the DMRS ports indifferent CDM group may have different QCL parameters. The QCLparameters being different means that some QCL parameters or all QCLparameters in the QCL parameter set are different. This type of the CDMgroup is referred to a type 1 CDM group, that is, a code division grouptype 1.

For the pattern with the two DMRS symbols, a method for notifying theCDM group type may include that the base station notifies the user ofthe CDM group type through signaling. Higher layer signaling may includehigher layer RRC signaling, MAC signaling or physical layer dynamicsignaling also may be used. All of the DMRS ports in each CDM group havethe same QCL parameters. The DMRS ports in different CDM groups may havedifferent QCL parameters. DMRS ports in the CDM group of the CDM grouptype 1 use same code in the time domain and different codes in thefrequency domain. For the type 2 CDM group, one type 2 CDM groupincludes two type 1 CDM groups, and the DMRS ports included in the twotype 1 CDM groups occupy the same time frequency resources, and theirtime domain OCCs are different. The number of DMRS ports included ineach CDM group of the type 1 CDM group is half of the number of the DMRSports included in the each CDM group of the type 2 CDM group.

In this way, for the base station having a small number of antennapanels, or for the users not using the multi-TRP transmission, the basestation may be configured in the type 1 CDM group, otherwise needs to beconfigured in the type 2 CDM group.

Optionally, the base station only needs the maximum number of the portgroups of the demodulation reference signal, which is configured by thehigher layer signaling to the user, without directly notifying the CDMgroup (code domain group) type. If the maximum number of port groups ofthe demodulation reference signal exceeds a threshold, then the CDMgroup type is type 1, otherwise is type 2.

When transmitting the multiple DMRS ports to one user, the multiple DMRSports may be divided into multiple type 1 DMRS port groups. All QCLparameters of all ports in each DMRS port group are the same, while theQCL parameters of the ports in different DMRS port groups may bedifferent. So that one DMRS port group may include DMRS ports from oneor more CDM groups, and all QCL parameters of these ports are the same.However, the QCL parameters of the DMRS ports in different DMRS groupsmay be different. In this case, the QCL parameter information of eachDMRS group needs to be indicated to the user by the base station by thesignaling.

Similar to the LTE, the base station may configure multiple sets of PQIparameters for the user by the higher layer signaling. Each set of PQIparameters includes PDSCH mapping and QCL parameter relevantinformation, which may indicate the user a Channel state informationreference signal (CSI-RS) configuration identifier (ID). The user, whenreceiving the DMRS and data, uses the RS to which this configuration IDcorresponds to perform a relevant estimation of some parameters of theQCL. For example, the CSI-RS is used to estimate the Doppler shift,Doppler spread, average delay and delay spread, then the estimationresults is used for the DMRS and data demodulation. Meanwhile, otherparameters, such as csi-RS-ConfigZPId-r11, are used to indicate the userpositions of some zero-power reference signals, or other referencesignals. That is, no data is transmitted on these positions. In thisway, the UE knows how to perform a data channel mapping or a ratematching. Usually, the higher layer configures four sets of PQIparameter sets, and then uses 2 bits in the DCI to select one of the PQIparameter sets to the user.

In the NR, there exists a case where the multiple DMRS groups correspondto different QCL parameters, parameters included in each PQI parameterset may vary. The maximum number of the DMRS port groups, which areconfigured for one user by the base station through the higher layersignaling, is two. That is, each PQI parameter set should be configuredwith relevant information of two sets of QCL, such as,

{ parameter subset 1, which is used for the data channel mapping or therate matching parameter subset 2-1, which indicates a reference signalconfiguration ID#0 and estimates relevant QCL parameters parametersubset 2-2, which indicates a reference signal configuration ID#1 andestimates relevant QCL parameters }

The reference signal to which the reference signal configuration ID #0corresponds and the DMRS port group #0 have a QCL relationship. Thereference signal to which the reference signal configuration ID #1corresponds and the DMRS port group #1 have the QCL relationship. Thereference signal to which the reference signal configuration ID #0 orthe reference signal configuration ID #1 corresponds may be one or moreof a synchronize signal block (SS block), CSI-RS and tracking referencesignal (TRS). Generally, the QCL parameters include the Doppler shift,Doppler spread, average delay, delay spread and spatial Rx parameters.So, the reference signal to which reference signal configuration ID #icorresponds and the DMRS port group #i are quasi co-located regardingthe Doppler shift, Doppler spread, average delay, delay spread andspatial Rx parameters. Specifically, if the reference signalconfiguration ID #i includes multiple reference signals, then uses ofthe multiple reference signals may be different. For example, thereference signal configuration ID #i includes the CSI-RS and thetracking reference signal (TRS). The CSI-RS and the DMRS are quasico-located with respect to the average delay, delay spread and spatialRx parameters, while the TRS and the DMRS are quasi co-located withrespect to the Doppler shift and Doppler spread.

For a multi-panel transmission, if all data and DMRS ports are from thesame oscillator, then only one PTRS port is needed. If the DMRS portsare from different oscillators, then different PTRS ports are needed.Similarly, for the multi-TRP transmission, since the multiple TRPs havedifferent oscillators, multiple PTRS ports are needed. However, the casedynamically varies between the single-TRP transmission and the multi-TRPtransmission, and between the single-panel transmission and themulti-panel transmission, different ports are needed. That is, sometimesthe PTRS ports needs multiple ports, and sometimes needs signal port,and different cells or different users have different requirements. Forexample, for a TRP #0 with a single panel, a UE #0 connected to the TRP#0 is a cell-center user, and then the multi-TRP transmission is notneeded. So, only one PTRS port is needed. Another UE #1 is a cell-edgeuser, then the multi-TRP transmission is needed, and in this case themultiple PTRS ports may be needed. To save the signaling overhead, thebase station may configure the maximum number of PTRS ports for eachuser by the higher layer signaling, and dynamically select the number ofPTRSs actually transmitted. For example, if the maximum number of PTRSports configured for the UE #0 by the higher layer signaling is 1, thenumber of PTRS ports is not needed to be dynamically notified. If themaximum number of PTRS ports configured for the UE #0 by the higherlayer signaling is 2, then 1 bit signaling is needed to dynamicallynotify that the number of PTRS ports is 1 or 2. If the maximum number ofPTRS ports configured for the UE #0 by the higher layer signaling is 4,then 2 bits signaling is needed to dynamically notify that the number ofPTRS ports. In this way, dynamic signaling overhead may be effectivelysaved for different cases. However, this method still needs an accuratesignaling to indicate the maximum number of PTRS ports.

A method for indicating the maximum number of PTRS ports may includethat the maximum number of PTRS ports is equal to the maximum number ofthe type 1 DMRS port groups. All DMRS ports in the type 1 DMRS portgroup are quasi co-located with respect to all QCL parameters. SinceDMRS ports in the same DMRS port group are quasi co-located with respectto all QCL parameters, then one DMRS group maximally needs one PTRSport. The QCL parameters among different DMRS port groups are not fixed.Each DMRS port group may need one PTRS port, so the maximum number ofPTRS ports may not be notified by the signaling, but is predefined to beequal to the maximum number of the type 1 DMRS port groups. In this way,the higher layer signaling overhead may be effectively saved.

That is to say, since different DMRS port groups may come from differentTRPs, or from different antenna panels of one TRP, each DMRS port groupneeds one PTRS port to estimate phase noises. Since different TRPs havedifferent oscillators, different antenna panels may have differentoscillators, and phase noises generated by different crystal oscillatorsare different, the PTRS ports need to be configured independently. Forsimplification, the DMRS port groups may all have one PTRS port bydefault. In this way, the base station does not need to additionallynotify the number of the PTRS ports because the number of the PTRS portsis equal to the number of the DMRS port groups. Meanwhile, the PTRS maybe connected to a DMRS port with the smallest port identifier in theDMRS port group corresponding to the PTRS. That is, a precoding of thePTRS port is the same with a precoding of the DMRS port with thesmallest port identifier in the corresponding DMRS port group.

It is to be noted that the QCL parameters include the average gain,Doppler shift, Doppler spread, average delay, delay spread and spatialRx parameters, or only include the average gain, Doppler shift, Dopplerspread, average delay and delay spread, which depends on differentcases.

It is assumed that the DMRS only has one symbol and support up to sixports, the DMRS pattern is shown in FIG. 3 . It is assumed that themaximum number of the DMRS port groups is two and semi-staticallyconfigured by the higher layer signaling (RRC signaling or RRC signalingcombined with MAC CE signaling). Combined with the number of the DMRSports, the DMRS groups may be configured in advance to correspond to theCDM groups. The DMRS ports in one CDM group only belong to one DMRSgroup. Of course, one DMRS group may include ports to which one or moreCDM groups correspond. Table 1 is a demodulation reference signalinformation indication table according to example 1. As shown in table1, in indication 6, the p0 corresponds to DMRS group 0, and the p2corresponds to DMRS group 1. This correspondence relationship may bepre-defined in the table without notifying by the signaling.

Since the maximum number of the DMRS port groups is two, the maximumnumber of the PTRS ports is two. When only one DMRS group is provided,the PTRS is the port m0, otherwise, the PTRS is the ports m0 and m1. Asshown in the table, such as in indication 7, the ports p1 and p3respectively correspond to the PTRS ports m0 and m1. In indication 9,the ports p0 and p1 correspond to the m0, the port p2 corresponds to them1, and the m0 and the p1 match. That is, the m0 and the p1 have thesame precoding. In indication 10, the port p3 corresponds to the m0, thep4 and p5 correspond to the m1, and the m1 and the p4 match. The m1 andthe p4 have the same precoding.

TABLE 1 DMRS PTRS Indication layers port (s) port 0 1 p0 m0 1 1 p1 m0 21 p2 m0 3 1 p3 m0 4 1 p4 m0 5 1 p5 m0 6 2 p0 p2 m0 m1 7 2 p1 p3 m0 m1 82 p4, p5 m0 9 3 p0, p1 p2 m0 m1 10 3 p3 p4, p5 m0 m1 11 4 p0, p1 m0 m1p2, p3 12 5 p0, p1 m0 m1 p2, p3, p4 13 6 p0-p5 m0

All QCL parameters in the DMRS port group are the same. Since theprecoding of the PTRS is the same as the precoding of the matched DMRSport, the PTRS and the matched DMRS port are quasi co-located withrespect to all parameters of the QCL parameter set, so that it can beconcluded that PTRS and the corresponding DMRS port group are quasico-located with respect to all QCL parameters. As described above, onePTRS port corresponds to one DMRS port group, and matches the DMRS portwith the smallest port identifier in the DMRS port group.

However, a simple reference to the one-to-one correspondencerelationship between the PTRS ports and the DMRS port groups mayincrease the PTRS overhead. If the DMRS port groups from the multipleantenna panels of one TRP share one oscillator, then these DMRS portgroups may share one PTRS port. FIG. 5 is a schematic diagram ofmultiple DMRS port groups sharing one oscillator according to exampleone. As shown in FIG. 5 , since the multiple DMRS port groups may befrom different beams, some QCL parameters are different, not all QCLparameters are different. Since the multiple DMRS port groups are fromone TRP and sharing one oscillator, actually, two DMRS port groups andthe shared PTRS are still quasi co-located with respect to some QCLparameters. Specifically, all DMRSs in the two DMRS port groups arestill quasi co-located with respect to Doppler spread and Doppler shift.

To save the overhead, the relationship between the two DMRS port groupsneeds to be indicated in the PQI parameter set. A method for indicatingthe PTRS port may include indicating PTRS port information by usingindication information of PQI.

In some embodiments, the indication information of PQI is used toindicate the number of the PTRS ports.

One implementation mode is indicating, in the PQI parameter set, whetheror not the multiple DMRS port groups are quasi co-located regarding QCLparameters {Doppler spread and Doppler shift}. Each DMRS port group isquasi co-located regarding all QCL parameters. If some DMRS port groupsare quasi co-located regarding the QCL parameters {Doppler spread andDoppler shift}, then these DMRS port groups share one PTRS port. If someDMRS port groups are not quasi co-located regarding the QCL parameters{Doppler spread and Doppler shift}, then these DMRS port groups cannotshare one PTRS port.

If the parameter subset 3 indicates that the DMRS port groups to whichthe parameter subsets 2-1 and 2-2 correspond are quasi co-locatedregarding the QCL parameters {Doppler spread and Doppler shift}, thenthe two DMRS port groups share one PTRS port, otherwise the two DMRSport groups each have one PTRS port respectively.

{ parameter subset 1: used for the data channel mapping or the ratematching parameter subset 2-1: indicates the reference signalconfiguration ID#0 and estimates relevant QCL parameters parametersubset 2-2: indicates the reference signal configuration ID#1 andestimates relevant QCL parameters parameter subset 3: used forindicating whether or not the DMRS port group to which the parametersubset 2-1 corresponds and the DMRS port group to which the parametersubset 2-2 corresponds are quasi co-located regarding the QCL parameters{Doppler spread and Doppler shift} }

Another direct mode is directly indicating, in the PQI parameter set,whether or not the multiple DMRS port groups share one PTRS port. For acase of two DMRS port groups, if the two DMRS port groups share one PTRSport, only one PTRS port is configured. If the two DMRS port groups donot share one PTRS port, two PTRS ports need to be configured.

{ parameter subset 1: used for the data channel mapping or the ratematching parameter subset 2-1: indicates the reference signalconfiguration ID#0 and estimates relevant QCL parameters parametersubset 2-2: indicates the reference signal configuration ID#1 andestimates relevant QCL parameters parameter subset 3: used forindicating whether or not the DMRS port group to which the parametersubset 2-1 corresponds and the DMRS port group to which the parametersubset 2-2 corresponds share the PTRS port }

If the PQI parameter set includes only one parameter subset forcalculating relevant QCL parameters, then the parameter subset 3 is notused because in this case there is only one parameter subset, whichmeans that there is only one DMRS port group.

Another implementation mode is that the UE determines, according todifferent reference signal configurations indicated in the PQI parameterset, quasi-colocation situation of different DMRS port groups regardingthe QCL parameters {Doppler spread and Doppler shift}. If a certainreference signal included in the reference signal configuration ID #0indicated by the parameter subset 2-1 and a certain reference signalincluded in the reference signal configuration ID #1 indicated by theparameter subset 2-2 are quasi co-located regarding parameters {Dopplerspread and Doppler shift}, then the DMRS port groups to which theparameter subset 2-1 and parameter subset 2-2 correspond may share onePTRS port, otherwise two PTRS ports need to be configured for the DMRSport groups to which the parameter subset 2-1 and parameter subset 2-2correspond.

{ parameter subset 1: used for the data channel mapping or the ratematching parameter subset 2-1: indicates the reference signalconfiguration ID#0 and estimates relevant QCL parameters parametersubset 2-2: indicates the reference signal configuration ID#1 andestimates relevant QCL parameters }

Table 2 is a table of four sets of PQI parameters according toexample 1. As shown in table 2, the base station configures the foursets of PQI parameters through the higher layer signaling, and themaximum number of the DMRS port groups configured by the base stationfor the user is two, that is, up to two parameter subsets indicatedifferent QCL parameters. It is assumed that NZP CSI-RS is used forestimating the QCL parameters {average delay, delay spread and spatialRx parameters}, while the TRS is used for estimating the QCL parameters{Doppler spread and Doppler shift}. Since in the first set of PQIparameters and the second set of PQI parameters, TRS resources includedin the reference signal configuration indicated by the parameter subset2-1 and TRS resources included in the reference signal configurationindicated by the parameter subset 2-2 are the same, the two DMRS portgroups to which the parameter subsets 2-1 and 2-2 correspond are quasico-located regarding the QCL parameters {Doppler spread and Dopplershift}, then the two DMRS port groups share one PTRS port. So additionalsignaling indication is not needed, the UE only needs to determine,according to whether the reference signals configured by differentparameter subsets are quasi co-located regarding {Doppler spread andDoppler shift}, whether corresponding DMRS port groups share the PTRSport.

TABLE 2 Parameter Parameter PQI parameter set 1 set 2 First set ofSubset 2-1 ZP CSI-RS NZP CSI-RS TRS . . . PQI ID#0 ID#0 ID#0 parametersSubset 2-2 NZP CSI-RS TRS . . . ID#0 ID#0 Second set Subset 2-1 ZPCSI-RS NZP CSI-RS TRS . . . of PQI ID#1 ID#0 ID#0 parameters Subset 2-2NZP CSI-RS TRS . . . ID#1 ID#0 Third set of Subset 2-1 ZP CSI-RS NZPCSI-RS TRS . . . PQI ID#2 ID#2 ID#0 parameters Subset 2-2 NZP CSI-RS TRS. . . ID#3 ID#2 Fourth set Subset 2-1 ZP CSI-RS NZP CSI-RS TRS . . . ofPQI ID#3 ID#0 ID#2 parameters Subset 2-2 NZP CSI-RS TRS . . . ID#2 ID#3

This method may need the higher layer signaling to inform the user thatthe reference signals of which resources are quasi co-located regarding{Doppler spread and Doppler shift}. Then, after the user is notified ofthe reference signal to which the reference signal configuration ID #0in the parameter subset 2-1 corresponds and the reference signal towhich the reference signal configuration ID #1 in the parameter subset2-2 corresponds, if reference signal resources regarding theparameters{Doppler spread and Doppler shift} are different, then theuser may determine, according to the higher layer signaling, whether ornot the DMRS port groups corresponding to the different reference signalresources are Quasi co-located regarding {Doppler spread and Dopplershift}. For example, in the third set of PQI parameters of the abovetable two, if the NZP CSI-RS ID #2 and NZP CSI-RS ID #3 are configuredto be Quasi co-located regarding {Doppler spread and Doppler shift} bythe higher layer signaling, then the UE knows that the two DMRS portgroups share the PTRS.

It is to be noted that the reference signals included in the referencesignal configuration ID indicated by each parameter subset may be one ormore reference signal types, such as the CSI-RS and TRS, and may also beone or more reference signal resources of one reference signal type, asshown in the above table two.

More directly, a method for notifying PTRS information is that the basestation may use the PQI indication information to directly indicate thePTRS port identifier. As described below, the PTRS port identifier isdirectly indicated in the subsets 2-1 and 2-2 which indicate relevantQCL parameters.

{ Parameter subset 1: used for the data channel mapping or the ratematching. parameter subset 2-1: indicates the reference signalconfiguration ID#0, estimates relevant QCL parameters and indicates thePTRS port identifier parameter subset 2-2: indicates the referencesignal configuration ID#1, estimates relevant QCL parameters andindicates the PTRS port identifier }

That is to say, the reference signal configurations ID #0 and ID #1indicated by the parameter subsets 2-1 and 2-2 include the PTRS one ormore port identifiers. The PTRS one or more port identifiers indicatedby the parameter subsets 2-1 and 2-2 may be the same or different. IfPTRS one or more port identifiers indicated by the parameter subsets 2-1and 2-2 are same, the PTRS is shared, otherwise the PTRS is not shared.Table 3 is a table of four sets of PQI parameters according to exampleone.

TABLE 3 Parameter Parameter PQI parameter set 1 set 2 First set ofSubset 2-1 ZP CSI-RS NZP CSI-RS TRS PTRS PQI ID#0 ID#0 ID#0 port 0parameters Subset 2-2 NZP CSI-RS TRS PTRS ID#0 ID#0 port 0 Second setSubset 2-1 ZP CSI-RS NZP CSI-RS TRS PTRS of PQI ID#1 ID#0 ID#0 port 0parameters Subset 2-2 NZP CSI-RS TRS PTRS ID#1 ID#0 port 0 Third set ofSubset 2-1 ZP CSI-RS NZP CSI-RS TRS PTRS PQI ID#2 ID#2 ID#0 port 0parameters Subset 2-2 NZP CSI-RS TRS PTRS ID#3 ID#2 port 1 Fourth setSubset 2-1 ZP CSI-RS NZP CSI-RS TRS PTRS of PQI ID#3 ID#0 ID#2 port 0parameters Subset 2-2 NZP CSI-RS TRS PTRS ID#2 ID#3 port 1

As shown in table 3, there are two types of DMRS groups. All DMRS portsin the type 1 DMRS group are Quasi co-located regarding all QCLparameters, while all DMRS ports in the type 2 DMRS group are Quasico-located regarding {Doppler spread and Doppler shift} or share onePTRS port, so the type 2 DMRS group may include one or more type 1 DMRSgroups.

The higher layer signaling described in the present application refersto the RRC signaling, MAC layer signaling or RRC signaling plus MACsignaling.

Since no PQI signaling is defined in the NR, the PQI signaling describedin the present application may only include relevant QCL information orinclude both of PDSCH mapping information and the relevant QCLinformation.

In the above solutions, in examples of indicating PTRS port informationby using the PQI signaling, one set of PQI parameters including two DMRSport groups. In practice, one set of PQI parameters may include morethan two DMRS port groups.

For example, the base station directly indicates the PTRS portidentifier by using the PQI indication information. Four DMRS portgroups are described below.

{ Parameter subset 1 is used for the data channel mapping or the ratematching Parameter subset 2-1 indicates the reference signalconfiguration ID#0, estimates relevant QCL parameters and indicates thePTRS port identifier Parameter subset 2-2 indicates the reference signalconfiguration ID#1, estimates relevant QCL parameters and indicates thePTRS port identifier Parameter subset 2-3 indicates the reference signalconfiguration ID#1, estimates relevant QCL parameters and indicates thePTRS port identifier. Parameter subset 2-4 indicates the referencesignal configuration ID#1, estimates relevant QCL parameters andindicates the PTRS port identifier. }

In addition, optionally, the base station may respectively indicate QCLinformation of the multiple DMRS port groups by using independent PQIsignaling. In this way, one PQI indication needs two PQI indicationfields. This method may be applied to the solution described in thepresent application.

PQI Indication Field 1

{ parameter subset 1 is used for the data channel mapping or the ratematching Parameter subset 2-1 indicates the reference signalconfiguration ID#0, estimates relevant QCL parameters used for a DMRSport group #0 and indicates the PTRS port identifier }

PQI Indication Field 2

{ Parameter subset 1 is used for the data channel mapping or the ratematching Parameter subset 2 indicates the reference signal configurationID#0, estimates relevant QCL parameters used for a DMRS port group #1and indicates the PTRS port identifier }

Described below are several examples of the above embodiment. Theexample numbers are merely used to distinguish different examples, andare not necessarily used to represent a priority order.

Example 1a: DMRS Type 1

The DMRS pattern based on an Interleaved Frequency domain multiplexing(IFDM) is referred to DMRS type 1, which may effectively support up tofour ports when the DMRS includes one symbol (as shown in FIG. 6 ) andsupport up to eight ports when the DMRS includes two symbols (as shownin FIG. 7 ).

FIG. 6 is a schematic diagram 1 of the demodulation reference signaltype 1 according to example 1a. As shown in FIG. 6 , the DMRS ports aredivided into two CDM groups. The CDM group #0 includes ports p0 and p2.The ports p0 and p2 occupy the same time frequency resources, and aredistinguished by different codes, such as different cyclic shift (CS)sequences. The CDM group #1 includes ports p1 and p3. The ports p1 andp3 occupy the same time frequency resources, and are distinguished bydifferent codes.

FIG. 7 is a schematic diagram 2 of a demodulation reference signal type1 according to example 1a. In FIG. 7 , the eight ports are divided intotwo CDM groups. The CDM group #0 includes ports p0, p2, p4 and p6. Theports p0, p2, p4 and p6 occupy the same time frequency resources. Theports p0 and p2 use different codes on the frequency domain. Forexample, the port p0 uses CS sequence 0, and the port p2 uses CSsequence 1. The ports p4 and p6 also use different codes on thefrequency domain. The ports p0 and p2 use same OCC on the time domain.The ports p4 and p6 also use same OCC on the time domain, which isdifferent from the OCC used by the ports p0 and p2 on the time domain.Similarly, the CDM group #1 includes ports p1, p3, p5 and p7. The CSsequences used by the ports p1 and p3 on the frequency domain aredifferent, while the ports p1 and p3 use the same OCC on the timedomain. The CS sequences used by the ports p5 and p7 on the frequencydomain are different, while the ports p5 and p7 use the same OCC on thetime domain, which is different from the code used by the ports p1 andp3 on the time domain. All ports in one CDM group are mapped onto thesame time frequency resources, and are distinguished by different timedomain codes or frequency domain codes. This type of CDM group isreferred to as a type 2 CDM group.

Similar to the DMRS type 2, if the number of the CDM groups is limitedto two, it means that the number of the DMRS port groups is limited totwo. That is, up to two beam transmissions with different QCLs aresupported, which may limit the scheduling, especially during themulti-TRP and multi-panel transmission.

To support more DMRS port groups, for the DMRS pattern with two symbols,as shown in FIG. 7 , optionally, the eight DMRS ports are divided intofour CDM groups. The CDM group #0 includes ports p0 and p2. The ports p0and p2 use different codes on the frequency domain. For example, theport p0 uses CS sequence 0, and the port p2 uses CS sequence 1. The CDMgroup #1 includes ports p1 and p3. The ports p1 and p3 use differentcodes on the frequency domain. The CDM group #2 includes ports p4 andp6. The ports p4 and p6 use different codes on the frequency domain. TheCDM group #3 includes ports p5 and p7. The ports p5 and p7 use differentcodes on the frequency domain. The DMRS ports in the CDM group #0 andthe DMRS ports in the CDM group #2 occupy the same time frequencyresources, and are distinguished by different time domain OCCs.Similarly, the DMRS ports in the CDM group #1 and the DMRS ports in theCDM group #3 occupy the same time frequency resources, and aredistinguished by different time domain OCCs. In this way, the DMRS portsmay be divided into up to four DMRS port groups. This type of CDM groupis referred to as the type 1 CDM group, that is, a code domain grouptype 1.

A method for indicating the CDM group type may include that the basestation notifies the user of the CDM group type by using signaling. Thesignaling generally refers to the higher layer RRC signaling, and thesignaling may also be the MAC signaling or the physical layer dynamicsignaling. DMRS ports in each CDM group have the same QCL parameters.The QCL parameters of the DMRS ports in different CDM groups may bedifferent. For the type 1 CDM group, the DMRS ports in the CDM group usethe same codes on the time domain, and use different codes on thefrequency domain. One type 2 CDM group includes two type 1 CDM groups,and the DMRS ports included in the two type 1 CDM groups occupy the sametime frequency resources, and use different time domain codes. Thenumber of DMRS ports included in each CDM group of the CDM group type 1is half of the number of the DMRS ports included in the each CDM groupof the CDM group type 2.

In this way, for the base station which has a small number of antennapanels, or for the users not using the multi-TRP transmission, the basestation may be configured according to the CDM group type 1, otherwisethe base station needs to be configured according to the CDM group type2. Such design is beneficial to the DMRS signaling design. DMRSinformation notifications may be designed independently for differentCDM types.

Another method for implicitly indicating the CDM group type is that thebase station indicates the CDM group type implicitly by indicating themaximum number of the DMRS port groups. If the maximum number of theDMRS port groups of which the user is notified is greater than N, theCDM group type is type 1, otherwise the CDM group type is type 2.

For the DMRS type 1, the PTRS port information may also be indicated bythe indication information of PQI. In some embodiments, the indicationinformation of PQI is used to indicate the number of the PTRS ports.

One implementation mode is indicating, in the PQI parameter set, whetherthe multiple DMRS port groups are quasi co-located regarding QCLparameters {Doppler spread and Doppler shift}.

In some embodiments, the UE determines, according to different referencesignal configurations indicated in the PQI parameter set, whetherdifferent DMRS port groups are quasi co-located with respect to the QCLparameters {Doppler spread and Doppler shift}. If a reference signalincluded in the reference signal configuration ID #0 indicated in theparameter subset 2-1 and a reference signal included in the referencesignal configuration ID #1 indicated in the parameter subset 2-2 arequasi co-located with respect to parameters {Doppler spread and Dopplershift}, then the DMRS port groups corresponding to the parameter subset2-1 and parameter subset 2-2 may share one PTRS port, otherwise two PTRSports need to be configured for the DMRS port groups corresponding tothe parameter subset 2-1 and parameter subset 2-2. In this case, a thirdparameter set does not need to be introduced to associate the QCLparameter set corresponding to the DMRS port group.

It is to be noted that though the base station indicates the number ofthe PTRS ports by the PQI, such as one, in practice, the PTRS may be nottransmitted on this port, which also depends on factors such as aModulation and Coding Scheme (MCS) configured for the user andbandwidth. If the MSC is too small, or the number of allocated bandwidthresources or the number of allocated Physical Resource Blocks (PRB) istoo small, and then the PTRS is not transmitted. In addition, the PTRSis the reference signal used for phase tracking, and may also be aspecial DMRS.

The method described above mainly uses the PQI signaling to jointlyindicate information such as the number of PTRS ports and one or moreport identifiers. This method is mainly used in downlink becauserelevant QCL indication information is generally in the downlink. Forthe uplink, if there is no relevant QCL signaling, how to notify theuser of the number of the PTRS ports and the one or more portidentifiers is a problem. One direct method is using clear signaling todynamically indicate the PTRS port information, which increases theoverhead of DCI used for notifying uplink scheduling information.

In the NR, not only the base station may be provided with multi-antenna,but also the user have many antennas, and may have many antenna panels.If different antenna panels share the same oscillator, then the useronly needs one PTRS port. However, if different antenna panels do notshare the oscillator, then the DMRS ports from different panels need tocorrespond to the PTRS ports independently. In other words, if some DMRSports are from the same panel, then these DMRS ports correspond to onePTRS port, otherwise these DMRS ports may correspond to different PTRSports.

In addition, in the NR, the base station performs a beam training beforescheduling user data. For example, the base station configures multipleSRS resources for one user by the higher layer signaling. Each SRSresource represents a respective beam transmitted by the user. Forexample, if the user has two antenna panels, each panel may transmit theSRS by the beams in four different directions, the two panels need to beconfigured with eight SRS resources to transmit the beams in eightdifferent directions. The IDs of the eight SRS resources may be from 0to 7. After the user transmits eight SRSs with different beams on theconfigured 8 SRS resources, the base station may determine which beam orbeams are better in data transmission by means of measurement. So whenscheduling the user to transmit uplink data, the base station needs tonotify the user of using which beam to transmit data in the DCI. In thiscase, the base station may notify the user of a SRS resource indicator(SRI) value in the DCI. The SRI represents the ID of the SRS resourcethat was used for data transmission.

The base station may only notify the user of one SRI, in this case, thebeam used by the user for transmitting data is the same as the beam usedby the SRS resource transmitted before and corresponding to the SRI.Since one SRI generally corresponds to one SRS resource, generallycorresponds to one analog beam and is from one panel, one SRI just needsto be correspondingly configured with one PTRS port. When transmittingdata, the user uses the analog beam corresponding to the SRI to transmitdata. The analog transmission beam may have different digital beamscorresponding to different DMRS ports. That is to say, although the basestation indicates one SRS to the user, uplink DMRS ports may also bemultiple. When a channel reciprocity does not hold, the base stationalso needs to configure a Transmit precoder matrix indicator (TPMI) forthe user, and the user performs an uplink pre-coding according to anindication of the TPMI.

In addition, the base station may also notify the user of multiple SRIs.Each SRI corresponds to one beam and corresponds to one SRS resource. Tosimplify the standard, it is possible to implement by way of one SRScorresponding to one DMRS port. That is, the user transmits the data byusing the beams indicated by allocated multiple SRIs when transmittingthe data. Each beam corresponds to one DMRS port. In this case, if thebeams indicated by the multiple SRIs are from different antenna panels,then one PTRS is apparently not enough. If the beams indicated by themultiple SRIs are from one antenna panel, one PTRS is enough.

It can be seen that the base station may use the SRI signaling toindicate the PTRS port information, including the number of ports andport ID. If the base station notifies the user that only one SRI is usedfor transmitting the uplink data, then the only one PTRS port may beused. However, if the base station notifies the user that multiple SRIsare used for transmitting the uplink data, then the number of PTRS portsmay be one or multiple.

A method for indicating uplink PTRS port information may include thatthe first communication node notifies the second communication node ofthe configuration information of the transmission beam and theconfiguration information of phase tracking reference signal through thejoint signaling.

In some embodiments, the configuration information of the phase trackingreference signal includes at least one of: the number of phase trackingreference signal ports, one or more port identifiers of the phasetracking reference signal ports and the maximum number of the phasetracking reference signal ports.

In some embodiments, the configuration information of the transmissionbeam includes at least one of: the resource indication of the soundingreference signal and the precoding information indication.

In some embodiments, the configuration information of the transmissionbeam includes at least one of the resource indication of the soundingreference signal and a downlink reference signal resource indication.

SRI is the ID of the resource indication of the SRS resource. Inaddition to the SRI, the base station may notify the user of theprecoding information TPMI. If TPMIs between two SRIs are related, forexample, the TPMIs corresponding to the two SRIs indicated to the userat the same time by the base station have a phase difference, the beamscorresponding to the two SRIs belong to the same panel. The beamscorresponding to the two SRIs are equivalent to being subjected to alinear combination. In this case, the DMRS ports corresponding to thetwo SRIs may share one PTRS port. Otherwise effects of the linearcombination may be affected by the phase noises.

In some embodiments, SRS resource configuration includes the PTRS portinformation. Generally, the base station configures N SRS resources forthe user by the higher layer signaling, and then the user periodicallytransmits the SRSs on the N SRS resources, or aperiodically transmitssome SRSs of the N SRS resources, or semi-persistently transmits it.During the configuration of the higher layer signaling, theconfiguration information of one SRS resource generally includesmultiple or all of a SRS bandwidth, starting position, frequency domaindensity, the number of antenna ports, whether or not performing afrequency hopping, cycle and the like.

SRS resource ID#i { SRS bandwidth, frequency domain position, frequencydomain density, time domain position, the number of antenna ports,frequency hopping information, cycle ... }

When the high layer signaling configures these parameters of one SRSresource, the base station may add one item, that is, the PTRS portinformation, such as the PTRS port identifier. The maximum PTRS portidentifier may be the maximum number of the PTRS ports reported by theuser. So during the configuration of the base station by using thehigher layer signaling, the configuration parameters of the SRS resourceare described below, and the PTRS port ID is added.

SRS resource ID#i { SRS bandwidth, frequency domain position, frequencydomain density, time domain position, the number of antenna ports,frequency hopping information, cycle, ... PTRS port ID }

If one user supports up to one PTRS port, then the ID of the PTRS portis 0 by default, or the PTRS port information may not be provided. Ifone user supports up to two PTRS ports, then the IDs of the PTRS portsmay be 0 or 1.

For example, one user supports a maximum of two PTRS ports. That is, theuser has two antenna panels. Each panel corresponds to N SRS resources,that is, each panel corresponds to N beams. When the base stationconfigures 2N SRS resources through the higher layer signaling, in thefirst N SRS resources, the ID of the PTRS port is 0, and in the last NSRS resources, the ID of the PTRS port is 1. In this way, the basestation indicates multiple SRIs when notifying uplink scheduling datathrough the DCI, such as two SRIs, which correspond to two DMRS ports.After receiving two SRI values, the user may correspondingly find theIDs of the PTRS ports configured in the SRS resources corresponding tothe two SRIs. If the IDs of the PTRS ports configured in the SRSresources corresponding to the two SRIs are the same, then the DMRSports corresponding to the two SRIs are from the same panel, that is,the DMRS ports share one PTRS port. Otherwise two PTRS ports are needed.So the resource configuration of the SRS includes the PTRS portinformation. The resource configuration of the SRS is configured by thehigher layer signaling, generally is configured by the RRC signaling.That is to say, when the base station configures resource configurationinformation of the SRS by the higher layer signaling, the PTRS portinformation has been configured already.

In some embodiments, it is not necessary to configure the PTRS portinformation in the resource configuration information of each SRS. TheSRS resources that may share one PTRS port are configured into one SRSresource set or SRS resource group. Each SRS resource set corresponds toone PTRS port. Different SRS resource sets correspond to different PTRSports. For example, based on the above example, the base stationconfigures two SRS resource sets for the user. A first SRS resource setincludes N SRS resources, the resource IDs are from 0 to N−1. A secondSRS resource set also includes N SRS resources, the resource IDs arefrom N to 2N−1. When the base station schedules the user uplink data,the base station schedules one or more SRIs. Each SRS corresponds to oneSRS resource, and thus corresponds to one SRS resource set. If the SRIsallocated to the user belong to the same SRS resource set, the DMRSports corresponding to these SRIs share one PTRS port, otherwisemultiple PTRS ports are allocated to the DMRS ports. For a betterunderstanding, the SRS resource set number may be simply considered asthe PTRS port identifier.

The first SRS resource set {SRS resource ID #0, ID #1 . . . ID #N−1}.

The second SRS resource set {SRS resource ID #N, ID #N+1 . . . ID#2N−1}.

Generally speaking, the first communication node notifies the secondcommunication node of the configuration information of the transmissionbeam and the configuration information of the phase tracking referencesignal through the joint signaling. In some embodiments, theconfiguration information of the phase tracking reference signalincludes at least one of the number of phase tracking reference signalports, the one or more port identifiers of phase tracking referencesignal ports and the maximum number of the of phase tracking referencesignal ports. The configuration information of the transmission beam atleast includes information indicating the sounding reference signalresource. Generally, the resource indication of SRS refers to theresource ID of SRS. Each SRS resource corresponds to the configurationinformation of the SRS resource, which is configured by the base stationusing the higher layer signaling. That is, each resource indication ofSRS corresponds to the information indicating the resource of onesounding reference signal. The resource indication information refers tothe configuration information of the SRS resource, and may also includethe configuration information of the SRS resource set. The informationindicating the sounding reference signal resource or the configurationinformation of the SRS resource set includes the PTRS port information.

A whole process is described below. The first communication nodenotifies the second communication node of the configuration informationof the phase tracking reference signal and the SRI by using the jointsignaling. Each SRI corresponds to one SRS resource. One SRS resourcecorresponds to one SRS resource set. One SRS resource set corresponds toone PTRS port. After obtaining the SRI notified by the base station, theuser obtains the PTRS port information.

Optionally, the beams corresponding to the SRSs in one SRS resource setmay come from the same antenna panel. In this way, different SRSresource sets correspond to different antenna panels. The DMRSscorresponding to all beams in one SRS resource set correspond to thesame PTRS port identifier. The DMRSs corresponding to beams of differentSRS resource sets correspond to the same PTRS port identifier ordifferent PTRS port identifiers, which depends on whether the antennapanels corresponding to the different SRS resource sets share theoscillator. If the different SRS resource sets share the oscillator, thedifferent SRS resource sets correspond to the same PTRS port identifier.Otherwise, the different SRS resource sets correspond to different PTRSport identifiers. For a better understanding, it can simply consideredthat each SRS resource set is correspondingly configured with one PTRSport identifier. A PTRS ID #0 may be equal to or not equal to a PTRS ID#1, which depends on the configuration of the base station. That is, atleast each SRS resource set corresponds to the same PTRS portidentifier.

The first SRS resource set {[SRS resource ID #0, ID #1 . . . ID #N−1],PTRS ID #0}.

The second SRS resource set {[SRS resource ID #N, ID #N+1 . . . ID#2N−1], PTRS ID #1}.

Of course, the concept of SRS resource set may be not provided. In thiscase, the PTRS port information needs to be carried in the configurationof each SRS resource.

In conclusion, the configurations of the SRS resource and the resourceset are configured by the base station by using the higher layersignaling, rather than dynamically configured by the physical layer. Thebase station configures multiple SRS resources, and then notifies theuser of the IDs of one or more of the multiple SRS resources by usingthe physical layer dynamic signaling.

The scheme of carrying PTRS port information in the SRI and SRS resourceconfiguration may be well applied to almost all scenarios. Especiallywhen the channel has no reciprocity, the beam training must rely ontransmitting the SRS. When the channel has reciprocity, the base stationmay not use the SRI to indicate the beam by using which the usertransmits data, but use downlink reference signal resource ID. That is,the transmission beam configuration information used for indicating thePTRS port information includes a downlink reference signal resourceindication. The downlink reference signal resource indication may be aCSI-RS resource indication, that is, a CSI-RS resource Indicator (CRI),and may also be a synchronization signal resource or ID indication. Thebase station indicates one or more CSI-RS resources by using the CRI.The user uses a reception beam corresponding to the CRI to receive thisCSI-RS. The reception beam will be used for data transmission. Similarto the PTRS port information carried by the configuration information ofthe SRI and the SRS, the resource configuration information of the CRIand the CSI-RS may also be used to carry the PTRS port information. Forexample, the base station divides these CSI-RS resources into multiplesets when configuring the CSI-RS resources by using the higher layersignaling. Each set is correspondingly configured with one PTRS portidentifier. The PTRS port here refers to uplink PTRS port information.

In addition, the first communication node described in the presentapplication generally refers to the base station, and the secondcommunication node generally refers to the user. Of course, the firstcommunication node may refer to the user, which is used in a D2Dcommunication.

In addition, the PTRS described in the present application is generallyused for the phase noise estimation, and may be used for other purposes.Therefore, PTRS described in the present application is only a name of areference signal, and does not exclude other reference signals. Forexample, the PTRS is a special demodulation reference signal. Generally,the base station uses the higher layer signaling to configure theexistence of the PTRS, which depends on high frequencies or lowfrequencies. If the high layer signaling configures that the PTRSexists, whether or not the PTRS is actually transmitted and the PTRSdensity are also related to the MCS and bandwidth allocated to the userduring the scheduling.

Described below are examples that the base station indicates the DMRSconfiguration information by using the PQI indication information.

In some embodiments, the PQI indication information is used forindicating the number of symbols of the DMRS.

In some embodiments, the PQI indication information is used forindicating the DMRS type.

In some embodiments, the base station uses the PQI indicationinformation to indicate the type of the table indicating DMRSinformation. Multiple tables for indicating DMRS information arepredefined or configured by the higher layer signaling.

It can be seen from FIGS. 3 and 4 (DMRS type 2), FIGS. 6 and 7 (DMRStype 1), to achieve a sufficient flexibility, the standard needs tosupport demodulation reference signal type 1 and demodulation referencesignal type 2, and each demodulation reference signal type needs tosupport a case of one DMRS and a case of two DMRSs.

To save dynamic signaling overhead, the base station may use the higherlayer signaling to configure the demodulation reference signal type forthe user, meanwhile, may also use the higher layer signaling toconfigure the number of symbols of the demodulation reference signal forthe user. In this way, when designing the DCI signaling, each of thecase of one DMRS symbol and the case of two DMRS time domain symbols ofeach DMRS type needs to be independently designed with one table tonotify the DMRS port identifiers, the number of the DMRS ports, scramblesequence ID and whether or not being transmitted with the datasimultaneously. Therefore, the signaling overhead in the DCI is greatlyreduced. As shown in tables 4-7, for each DMRS type, each symbol onlyneeds five bits (that is, a value corresponding to an indication statusis less than or equal to 32). Based on the semi-static configuration,the base station may configure the DMRS symbol quantity (one DMRS symbolor two DMRS symbols) according to the average traffic volume and thenumber of users of the cell, so that the overhead of the DCI forindicating the DMRS information in controlled within 5 bits. If thenumber of the users in the cell is small and traffic volume is notlarge, the number of the users involved a multi-user scheduling at thesame time is not too big. If the number of DMRS ports required by theusers is not large, the base station may semi-statically configure oneDMRS symbol to the users of the cell. In this case, for the DMRS type 2,up to six DMRS ports are supported and for the DMRS type 1, up to 4 DMRSports are supported. If the number of the users in the cell is large andthe traffic volume is big, and the total number of DMRS ports for themulti-user scheduling is often big, the base station may configure twoDMRS symbols for the users of the cell. In this case, for the DMRS type2, up to 12 DMRS ports are supported, and for the DMRS type 1, up to 8DMRS ports are supported.

However, this method of semi-statically configuring the symbol quantityof DMRS limits the scheduling flexibility, especially for the usersinvolved in the multipoint transmission, such as the users performingDynamical point selection (DPS) transmission. It is assumed that theDMRS type is semi-statically configured for the user by RRC signaling,and is same in each cell. FIG. 8 provides a schematic diagram of amultipoint dynamic switching transmission. As shown in FIG. 8 , at slotn, a transmission receiver point (TRP) #0 transmits data to the UE #0,while at slot n+1, a TRP #1 transmits data to the UE #0. The basestations transmitting data to the UE #0 are dynamically switched. Inthis case, since the number of connected users and traffic volume in theTRP #0 may be different from that in the TRP #1, the DMRS symbolquantity required in TRP #0 may be different from that in TRP #1. Forexample, for TRP #0, in the service cell of UE #0, the traffic volume isbig and the number of connected users is large, two DMRS symbols aregenerally required, so the number of DMRS symbols that the TRP #0configures for UE #0 through the RRC signaling is two. TRP #1 has asmall traffic volume and few connected users. For saving the overheadand a more efficient DMRS design, the base station just needs toconfigure one DMRS symbol for the user. In this case, since differentTRPs need different DMRS symbol quantities, semi-statically configuringthe DMRS symbol quantity may have problems. When the TRP which transmitsdata to the UE #0 is switched to the TRP #0, since the DMRS symbolquantity semi-statically configured to the UE #0 is still 2, the TRP #1is forced to use 2 DMRS symbols to transmit data to the UE #0, causingunnecessary waste. If other users in the TRP #1 want to perform a jointmulti-user scheduling with the UE #0, the DMRS symbol quantities are notequal, because other users in the TRP #1 are likely to besemi-statically configured with 2 DMRS symbols.

If the symbol number of the DMRS is configured in a completely flexibleway, for each DMRS type, the base station need to dynamically indicatethe DMRS information about one symbol and 2 symbols through the DCIsignaling, which increases at least 1 bit DCI overhead.

A method for indicating the symbol number of the DMRS is that the basestation uses indication information of QCL and the data channel mapping(PQI: PDSCH RE Mapping and Quasi-Co-Location Indicator) to indicate thesymbol number of the DMRS. The indication information of QCL and thedata channel mapping is similar to the information indication in thetable 7.1.9-1 of the LTE standard 36.213. As described in the standard36.213, generally, the base station uses the higher layer signaling toconfigure multiple sets (for example, 4 sets) of parameters to indicatethe PDSCH RE Mapping and Quasi-Co-Location Indicator. As described inDCI format 2D in the standard 36.213, the base station indicates whichone of the multiple sets configured by the higher layer by usingsignaling of several bits, such as 2 bits. If it is a DPS scheduling,the multiple sets of PQI parameters configured by the higher layer maycorrespond to different TRP transmissions. For reasonably and flexiblyconfiguring different DMRS symbols for different TRPs, parametersindicated by the PQI may include the symbol number of the DMRS.Therefore, multiple sets of PQI parameters configured by the higherlayer may contain different DMRS symbol quantities. In other words, thePQI and the symbol number of the DMRS are jointly indicated. Forexample, two sets of PQI parameters configured by the base stationthrough the higher layer signaling are separately configured as follows:

the first set of PQI parameters

{ parameter subset 1: ZP-CSI-RS ID#0 parameter subset 2-1: NZP CSI-RSID#0 parameter subset 2-2: NZP CSI-RS ID#1 ... parameter subset i: oneDMRS symbol }

the second set of PQI parameters

{ parameter subset 1: ZP-CSI-RS ID#3 parameter subset 2-1: NZP CSI-RSID#3 parameter subset 2-2: NZP CSI-RS ID#4 ... parameter subset i: twoDMRS symbols }

In the DCI, the base station uses the dynamic physical layer signalingto indicate which set of PQI parameters, thereby achieving the purposeof dynamically indicating the symbol number of DMRS without additionallyadding physical layer dynamic signaling overhead.

Similarly, for the users who need to perform the Coordinated MultiplePoint (CoMP) transmission, such as the DPS, the TRP transmitting data tothe users may be dynamically switched, so the DMRS types (includingdemodulation reference signal type 1 and demodulation reference signaltype 2) need to be the same. Therefore, a method for indicating the DMRStype may include that the base station uses indication information ofQLC and the data channel mapping (PQI: PDSCH RE Mapping andQuasi-Co-Location Indicator) to indicate the DMRS type.

Table 4 is a table that the DMRS information indicates DMRS type 2 withone DMRS symbol, as shown in table 4:

TABLE 4 DMRS DMRS Scrambling Indication Layers port (s) symbols ID 0 1p0 1 symbol 0 1 1 p1 1 symbol 0 2 1 p2 1 symbol 0 3 1 p3 1 symbol 0 4 1p4 1 symbol 0 5 1 p5 1 symbol 0 6 2 p0, p2 1 symbol 0 7 2 p1, p3 1symbol 0 8 2 p4, p5 1 symbol 0 9 3 p0, p1, p2 1 symbol 0 10 3 p3, p4, p51 symbol 0 11 4 p0-p3 1 symbol 0 12 5 p0-p4 1 symbol 0 13 6 p0-p5 1symbol 0 14 1 p0 1 symbol 1 15 1 p1 1 symbol 1 16 1 p2 1 symbol 1 17 1p3 1 symbol 1 18 1 p4 1 symbol 1 19 1 p5 1 symbol 1 20 2 p0, p2 1 symbol1 21 2 p1, p3 1 symbol 1 22 2 p4, p5 1 symbol 1 23 3 p0, p1, p2 1 symbol1 24 3 p3, p4, p5 1 symbol 1 25 4 p0-p3 1 symbol 1

Table 5 is a table that the DMRS information indicates DMRS type 2 with2 DMRS symbol, as shown in table 5:

TABLE 5 DMRS DMRS Scrambling Indication layers port (s) symbols ID 0 1p0 2 symbols 0 1 1 p1 2 symbols 0 2 1 p2 2 symbols 0 3 1 p3 2 symbols 04 1 p4 2 symbols 0 5 1 p5 2 symbols 0 6 1 p6 2 symbols 0 7 1 p7 2symbols 0 8 1 p8 2 symbols 0 9 1 p9 2 symbols 0 10 1 p10 2 symbols 0 111 p11 2 symbols 0 12 2 p0, p2 2 symbols 0 13 2 p1, p3 2 symbols 0 14 2p6, p8 2 symbols 0 15 2 p7, p9 2 symbols 0 16 2 p4, p5 2 symbols 0 17 2p10, p11 2 symbols 0 18 3 p0, p1, p2 2 symbols 0 19 3 p6, p7, p8 2symbols 0 20 3 p3, p4, p5 2 symbols 0 21 3 p9, p10, p11 2 symbols 0 22 4p0-p3 2 symbols 0 23 4 p6-p9 2 symbols 0 24 4 p4, p5, p10, p11 2 symbols0 25 5 p0, p1, p6, 2 symbols 0 p2, p3 26 6 p0, p1, p6, p2, 2 symbols 0p3, p8 27 7 p0, p1, p6, p7, 2 symbols 0 p2, p3, p8 28 8 p0, p1, p6, p7,2 symbols 0 p2, p3, p8, p9

Table 6 is a table that the DMRS information indicates DMRS type 1 withone DMRS symbol according to example 2, as shown in table 6:

TABLE 6 DMRS DMRS Scrambling Value layers port (s) symbols ID 0 1 p0 1symbol 0 1 1 p1 1 symbol 0 2 1 p2 1 symbol 0 3 1 p3 1 symbol 0 4 2 p0,p1 1 symbol 0 5 2 p2, p3 1 symbol 0 6 2 p0, p2 1 symbol 0 7 2 p1, p3 1symbol 0 8 3 p0, p1, p2 1 symbol 0 9 4 p0-p3 1 symbol 0 10 1 p0 1 symbol1 11 1 p1 1 symbol 1 12 1 p2 1 symbol 1 13 1 p3 1 symbol 1 14 2 p0, p1 1symbol 1 15 2 p2, p3 1 symbol 1 16 2 p0, p2 1 symbol 1 17 2 p1, p3 1symbol 1 18 3 p0, p1, p2 1 symbol 1 19 4 p0-p3 1 symbol 1

Table 7 is a table that the DMRS information indicates DMRS type 1 withtwo DMRS symbol, as shown in table 7:

TABLE 7 DMRS DMRS Scrambling Indication layers port (s) symbols ID 0 1p0 2 symbols 0 1 1 p1 2 symbols 0 2 1 p2 2 symbols 0 3 1 p3 2 symbols 04 1 p4 2 symbols 0 5 1 p5 2 symbols 0 6 1 p6 2 symbols 0 7 1 p7 2symbols 0 8 2 p0, p1 2 symbols 0 9 2 p2, p3 2 symbols 0 10 2 p4, p5 2symbols 0 11 2 p6, p7 2 symbols 0 12 3 p0, p2, p4 2 symbols 0 13 3 p1,p3, p5 2 symbols 0 14 3 p0, p4, p1 2 symbols 0 15 4 p0, p2, p4, p6 2symbols 0 16 4 p1, p3, p5, p7 2 symbols 0 17 4 p0, p4, p1, p5 2 symbols0 18 5 p0, p2, p4, p1, p3 2 symbols 0 19 6 p0, p2, p4, p1, p3, p5 2symbols 0 20 7 p0, p2, p4, p6, p1, p3 2 symbols 0 21 8 p0-p7 2 symbols 022 1 p0 2 symbols 1 23 1 p1 2 symbols 1 24 1 p2 2 symbols 1 25 1 p3 2symbols 1 26 1 p4 2 symbols 1 27 1 p5 2 symbols 1 28 1 p6 2 symbols 1 291 p7 2 symbols 1 30 2 p0, p1 2 symbols 1 31 2 p2, p3 2 symbols 1

As described above, different DMRS types or different DMRS symbolquantities correspond to different DMRS information tables, that is, thePQI indication information is used to indicate the type of table forindicating the DMRS information. Multiple tables for indicating the DMRSinformation are predefined or configured with the higher layersignaling, as shown in tables 4-7. The table type indicated by the PQIis not necessarily limited to different DMRS types or different DMRSsymbol quantities. So, even if the DMRS type and DMRS symbol quantityhave been semi-statically configured by higher layer signaling, thephysical layer dynamic signaling is not used for selection, the use ofthis method is not affected.

The first communication node indicates the quasi-colocationconfiguration information and port mapping information of thedemodulation reference signal through the joint signaling. In this way,the port mapping refers to the table of DMRS information.

If the two DMRS port groups indicated by the PQI are quasi co-locatedwith respect to only a part of QCL parameters rather than all of the QCLparameters, the indication bits of the allocated two ports include p0and p2, or p2 and p3. Table 8a is a table that the DMRS informationaccording to example 2 indicates DMRS type 2 with one DMRS symbol. Asshown in Table 8a, two DMRS ports should belong to two DMRS port groupsor two CDM groups to ensure the QCL of DMRS ports in the same CDM groupis the same. If the two DMRS port groups indicated by the PQI are quasico-located with respect to all QCL parameters, the indicator bits of theallocated two ports include p0 and p1, or p2 and p3, or p4 and p5. Table8b is a table that the DMRS information according to example 2 indicatesDMRS type 2 with one DMRS symbol.

According to whether the two DMRS port groups are quasi co-located withrespect to all QCL parameters, the tables for indicating the DMRSinformation may be divided into multiple categories to reduce bits ofthe indication status of the DMRS table, thereby reducing the DCIoverhead.

In other words, the base station uses joint indication information tonotify the user of the indication information of PQI, and may alsoindicate the DMRS port mapping information even when only one DMRSinformation table is provided in this case, such as table 8a. Forindication i, if the PQI parameter subsets 2-1, 2-2 received by the UEare the same, the port indication bit i represents p0 and p1, otherwisethe port indication bit i is p0 and p2. That is to say, a DMRS portmapping relationship indicated by the indication bit is related to theindication information of PQI.

Since the QCL information indicated by the PQI is different, the DMRSport mapping is changed, the mapping from the PTRS to the DMRS port isalso changed.

TABLE 8a DMRS DMRS Scrambling PTRS Indication layers port (s) symbols IDport . . . . . . . . . 1 symbol . . . i 2 p0, p2 1 symbol 0 m0, m1 i + 12 p1, p3 1 symbol 0 m0, m1 . . . . . . . . . . . . . . . . . . . . . . .. . . . . . .

TABLE 8b DMRS DMRS Scrambling PTRS Indication layers port (s) symbols IDport . . . . . . . . . 1 symbol . . . i 2 p0, p1 1 symbol 0 m0 i + 1 2p2, p3 1 symbol 0 m0 i + 2 2 p4, p5 1 symbol 0 m0 . . . . . . . . . . .. . . .

Example 3

Different port orders correspond to different QCL relationships.

To save the PQI indication information, that is, to reduce the number ofPQI sets configured by the higher layer as much as possible, the basestation implicitly indicates the QCL information of different DMRS portgroups by the order of DMRS port mapping.

The First Set of PQI Parameters

{ parameter subset 1, which is used for the data channel mapping or therate matching parameter subset 2-1 which indicates the reference signalconfiguration ID#0 and estimates relevant QCL parameters parametersubset 2-2 which indicates the reference signal configuration ID#1 andestimates relevant QLC parameters }

The Second Set of PQI Parameters

{ parameter subset 1, which is used for the data channel mapping or therate matching parameter subset 2-1, which indicates the reference signalconfiguration ID#0 and estimates relevant QCL parameters parametersubset 2-2, which indicates the reference signal configuration ID#1 andestimates relevant QCL parameters }

As described above, to save the DCI overhead, it is assumed that thehigher layer signaling only configures 2 sets of PQI parameters for theuser. The first set of PQI parameters means a single-point transmissionsince the reference signal configuration ID of the parameter subset 2-1and the reference signal configuration ID of the parameter subset 2-2are the same. The second set of PQI parameters indicates the multi-TRPtransmission. The two DMRS port groups corresponding to the parametersubsets 2-1 and 2-2 are not quasi co-located. Only 1 bit DCI overhead isrequired to notify the user whether is the first set of PQI parametersor the second set of PQI parameters. However, during the multi-TRPtransmission, the scheduling is limited. For example, for a user with 5layers, as shown in table 1, when the indication is 12, the number ofDMRS ports allocated to one user is five, which are ports p0, p1, p2,p3, and p4 respectively. The DMRS port group #0 includes ports p0 and p1by fault, corresponding to PQI parameter subset 2-1. The DMRS port group#1 includes ports p2, p3 and p4, corresponding to PQI parameter subset2-2. That is to say, the TRP corresponding to PQI parameter subset 2-1is transmission layer 2 by default rather than layer 3. To support theflexible scheduling, one option may be added to the indication bits ofthe DMRS information. That is, for the five DMRS ports p2, p3, p4, p0and p1, compared with the p0, p1, p2, p3 and p4 included in theindication bits, the included DMRS ports are not changed, but the orderis changed. In this case, p2, p3 and p4 correspond to the PQI parametersubset 2-1 by default, and port p0 and p1 correspond to the PQIparameter subset 2-2.

To achieve flexibility, a method for indicating the different orders ofDMRS ports includes that multiple defined DMRS information indicatorbits include the same DMRS ports, and the multiple indicator bitsindicate different orders of DMRS ports. DMRS ports in different orderscorrespond to different QCL parameters. Table 9 is a table that the DMRSinformation indicates DMRS type 2 with one DMRS symbol. As shown inlayer 3 in table 9:

TABLE 9 DMRS DMRS Scrambling Indication layers port (s) symbols ID 0 1p0 1 symbol 0 1 1 p1 1 symbol 0 2 1 p2 1 symbol 0 3 1 p3 1 symbol 0 4 1p4 1 symbol 0 5 1 p5 1 symbol 0 6 2 p0, p2 1 symbol 0 7 2 p1, p3 1symbol 0 8 2 p4, p5 1 symbol 0 9 3 p0, p1, p2 1 symbol 0 10 3 p2, p0, p11 symbol 0 11 3 p3, p4, p5 1 symbol 0 12 3 p4, p5, p3 1 symbol 0

For example, if the maximum number of DMRS groups configured by the basestation for the user exceeds one, the indication of some DMRS ports mayhave some problems. For example, one DMRS symbol is used and thetransmission of one user UE #0 has 6 layers, that is, the number of DMRSports configured for the user is 6, and the PQI parameter set includesparameter subsets 2-1 and 2-2. If the QCL parameter informationindicated by subset 2-1 and the QCL parameter information indicated bysubset 2-2 are different, then problems may occur. It is assumed thateach DMRS port group contains the same number of DMRS ports, that is,each DMRS port group contains 3DMRS ports. In this case, one CDM groupcontains two DMRS ports from different DMRS groups, which does notconform to the previously predefined rule. The rule is that the DMRSports in the same CDM group must have the same QCL parameters. As shownin FIG. 3 , for example, the port group #0 includes ports p0, p1 and p2.the port group #1 includes ports p3, p4 and p5. If QCL parameters in thetwo port groups are different, that is, the QCL parameters in the portp2 and the QCL parameters in port p3 are different, since the port p2and the port p3 are in one CDM group, and the DLRS port in one CDM groupshould have the same QCL parameters, then the contradiction occurs.

To avoid this case, if one user configures six DMRS ports and the sixDMRS ports are mapped onto only one DMRS symbol, QCLs of all predefinedDMRS ports only use information of the QCL parameter subset 2-1 or onlyuse information of the QCL parameter subset 2-2. In other words, if oneuser is configured with QCL information of 2 port groups, and the useris configured with 6 DMRS ports which are mapped onto one DMRS symbol,then all predefined DMRS ports use the QCL information configured by theport group #0 or all predefined DMRS ports use the QCL informationconfigured by the port group #1. More simply, if one user is configuredwith QCL information of the two port groups, and the user is configuredwith six DMRS ports which are mapped onto one DMRS symbol, then allpredefined DMRS ports only use QCL information corresponding to portgroup #0 and do not use the QCL information corresponding to port group#1.

As an extension, if one user is configured with the QCL configurationinformation of multiple DMRS port groups, and some ports in the multipleport groups allocated to the user are from the same CDM group. In thiscase, all the predefined DMRS ports only use the QCL informationcorresponding to one of the DMRS port groups. Or more directly, if oneuser is configured with QCL configuration information of multiple DMRSport groups, and some ports in the multiple port groups allocated to theuser are from the same CDM group, in this case, all predefined DMRSports only use the QCL information corresponding to the first one of themultiple DMRS port groups. For example, the UE #0 is configured with theQCL information of the two DMRS groups, and the DMRS ports configured bythe base station for the user are ports p0, and p1. The ports p0 and p1are from the same CDM group, in this case, the predefined ports p0 andp1 only use the QCL parameter information configured in the parametersubset 2-1 and do not use the QCL parameter information configured inparameter subset 2-2.

From the description of the embodiment described above, it will beapparent to those skilled in the art that the method in the embodimentdescribed above may be implemented by software plus a necessarygeneral-purpose hardware platform, or may of course be implemented byhardware, but in many cases, the former is a preferred implementationmode. Based on this understanding, the solution provided by the presentapplication substantially, or the part sharing with the related art, maybe embodied in the form of a software product. The software product isstored on a storage medium (such as a ROM/RAM, a magnetic disk or anoptical disk) and includes several instructions for enabling a terminaldevice (which may be a mobile phone, a computer, a server or a networkdevice) to execute the method according to each embodiment of thepresent application.

A base station is provided by another embodiment of the presentapplication. FIG. 9 is a diagram illustrating the hardware constructionof the base station according to an embodiment of the presentapplication. As shown in FIG. 9 , the base station 90 includes:

a first processor 902, which is configured to determine joint signaling,where the joint signaling includes first information and secondinformation, the first information includes at least one of:quasi-colocation configuration information and configuration informationof a transmission beam; the second information includes at least one ofthe following: phase tracking reference signal configuration informationand configuration information of a demodulation reference signal; and

a first communication device 904, which is configured to transmit thejoint signaling to a second communication node.

What needs to be supplemented is that the example methods which may beexecuted by a first communication node in the method embodiments may beexecuted by the base station 90 in this embodiment.

A terminal is provided by another embodiment of the present application.FIG. 10 is a diagram illustrating the hardware construction of theterminal according to an embodiment of the present application. As shownin FIG. 10 , the terminal 100 includes:

a second communication device 1004, which is configured to receive jointsignaling transmitted by a first communication node, where the jointsignaling includes first information and second information, the firstinformation includes at least one of: quasi-colocation configurationinformation and configuration information of a transmission beam, andthe second information includes at least one of: configurationinformation of a phase tracking reference signal and configurationinformation of a demodulation reference signal; and

a second processor 1002, which is configured to receive, according tothe joint signaling, data transmitted by the first communication node,and/or perform data transmission with the first communication node.

What needs to be supplemented is that example methods executed by thesecond communication node in the method embodiments may be executed bythe terminal 100 in this embodiment.

What needs to be supplemented is that the terminal 100 may be a mobileterminal in FIG. 1

A device for indicating reference signal information is provided byanother embodiment of the present application, applied to the firstcommunication node, including:

a determining module, which is configured to determine joint signaling,where the joint signaling includes first information and secondinformation, the first information includes at least one of:quasi-colocation configuration information and configuration informationof a transmission beam, the second information includes at least one of:configuration information of a phase tracking reference signal andconfiguration information of a demodulation reference signal; and

a transmitting module, which is configured to transmit the jointsignaling to the second communication node.

What needs to be supplemented is that in the steps in the methodsexecuted by the first communication node in the method embodiments maybe executed by the above virtual device.

A device for indicating reference signal information is provided byanother embodiment of the present application, applied to the secondcommunication node, including:

a receiving module, which is configured to receive joint signalingtransmitted by the first communication node, where the joint signalingincludes first information and second information, the first informationincludes at least one of: quasi-colocation configuration information andconfiguration information of a transmission beam, the second informationincludes at least one of: configuration information of a phase trackingreference signal and configuration information of a demodulationreference signal; and

a transmission module, which is configured to receive, according to thejoint signaling, data transmitted by the first communication node,and/or perform data transmission with the first communication node.

What needs to be supplemented is that the steps in the methods executedby the second communication node in the method embodiments may beexecuted by the above virtual device.

It should be noted that the abovementioned modules may be implemented bysoftware or hardware, and the latter may be realized by, but not limitedto, the following form: the abovementioned modules are located in thesame processor, or the abovementioned modules are located in differentprocessors, respectively.

A system embodiment is further provided in this embodiment, which mayinclude the first communication node and the second communication nodein the above embodiment, as well as the steps in the methods executed bythe first communication node and the second communication node.

A processor is provided by another embodiment of the presentapplication. The processor is used for executing programs. Whenexecuted, the programs execute the method of any one of the embodimentsdescribed above.

A storage medium is provided by another embodiment of the presentapplication. The storage medium stores programs. When executed, theprograms execute the method of any one of the embodiments describedabove.

Apparently, those skilled in the art should know that each of theabove-mentioned modules or steps of the present application may beimplemented by a general-purpose computing device, the modules or stepsmay be concentrated on a single computing device or distributed on anetwork formed by multiple computing devices, and in some embodiments,the modules or steps may be implemented by program codes executable bythe computing devices, so that modules or steps may be stored in astorage device and executed by the computing devices. In somecircumstances, the illustrated or described steps may be executed insequences different from those described herein, or the modules or stepsmay be made into various integrated circuit modules separately, ormultiple modules or steps therein may be made into a single integratedcircuit module for implementation. In this way, the present applicationis not limited to any specific combination of hardware and software.

The above are only examples of the present application and are notintended to limit the present application, and for those skilled in theart, the present application may have various modifications andvariations. Any modifications, equivalent substitutions, improvementsand the like made within the spirit and principle of the presentapplication should fall within the scope of the present application.

Apparently, those skilled in the art should understand that theabove-mentioned modules or steps of the present disclosure may beimplemented by a general-purpose computing device, the modules or stepsmay be integrated on a single computing device or distributed on anetwork formed by multiple computing devices, and alternatively, themodules or steps may be implemented by program codes executable by thecomputing devices, so that modules or steps may be stored in a storagedevice and executed by the computing devices. In some circumstances, theillustrated or described steps may be executed in sequences differentfrom those described herein, or the modules or steps may be made intovarious integrated circuit modules separately, or multiple modules orsteps therein may be made into a single integrated circuit module forimplementation. In this way, the present application is not limited toany specific combination of hardware and software.

The above are embodiments of the present application and are notintended to limit the present application, and for those skilled in theart, the present application may have various modifications andvariations. Any modifications, equivalent substitutions, improvementsand the like made within the spirit and principle of the presentapplication fall within the scope of the present application.

1. A method for wireless communication, comprising: transmitting, by abase station to a terminal device, configuration information for aplurality of sounding reference signal resources, wherein theconfiguration information comprises, for each sounding reference signalresource of the plurality of sounding reference signal resources, aphase tracking reference signal (PTRS) port identifier that correspondsto the sounding reference signal resource; and notifying the terminaldevice of different sounding reference signal resource indications(SRIs) corresponding to different sounding reference signal resources,wherein, in response to PTRS port identifiers associated with thedifferent SRIs being same, demodulation reference signal (DMRS) portscorresponding to the different SRIs are associated with a same PTRSport.
 2. The method of claim 1, wherein the configuration information iscarried in a Radio Resource Configuration (RRC) signaling.
 3. The methodof claim 1, wherein the different SRIs are indicated by a DownlinkControl Information (DCI) message.
 4. The method of claim 1, wherein theconfiguration information further comprises, for each sounding referencesignal resource of the plurality of sounding reference signal resources,a frequency domain position and frequency hopping information.
 5. Themethod of claim 1, wherein the PTRS port identifier that corresponds toeach sounding reference signal resource is 0 or
 1. 6. A method forwireless communication, comprising: receiving, by a terminal device froma base station, configuration information for a plurality of soundingreference signal resources, wherein the configuration informationcomprises, for each sounding reference signal resource of the pluralityof sounding reference signals, a phase tracking reference signal (PTRS)port identifier that corresponds to the sounding reference signalresource; receiving, by the terminal device, a notification from thebase station indicating different sounding reference signal resourceindications (SRIs) corresponding to different sounding reference signalresources, wherein, in response to PTRS port identifiers associated withthe different SRIs being same, demodulation reference signal (DMRS)ports corresponding to the different SRIs are associated with a samePTRS port; and performing, by the terminal device, an uplinktransmission based on the different SRIs.
 7. The method of claim 6,wherein the configuration information is carried in a Radio ResourceConfiguration (RRC) signaling.
 8. The method of claim 6, wherein thedifferent SRIs are indicated by a Downlink Control Information (DCI)message.
 9. The method of claim 6, wherein the configuration informationfurther comprises, for each sounding reference signal resource of theplurality of sounding reference signal resources, a frequency domainposition and frequency hopping information.
 10. The method of claim 6,wherein the PTRS port identifier that corresponds to each soundingreference signal resource is 0 or
 1. 11. A wireless communicationdevice, comprising: a processor; and a memory including processorexecutable code, wherein the processor executable code upon execution bythe processor configures the processor to: transmit, to a terminaldevice, configuration information for a plurality of sounding referencesignal resources, wherein the configuration information comprises, foreach sounding reference signal resource of the plurality of soundingreference signal resources, a phase tracking reference signal (PTRS)port identifier that corresponds to the sounding reference signalresource; and notifying the terminal device of different soundingreference signal resource indications (SRIs) corresponding to differentsounding reference signal resources, wherein, in response to PTRS portidentifiers associated with the different SRIs being same, demodulationreference signal (DMRS) ports corresponding to the different SRIs areassociated with a same PTRS port.
 12. The wireless communication deviceof claim 11, wherein the configuration information is carried in a RadioResource Configuration (RRC) signaling.
 13. The wireless communicationdevice of claim 11, wherein the different SRIs are indicated by aDownlink Control Information (DCI) message.
 14. The wirelesscommunication device of claim 11, wherein the configuration informationfurther comprises, for each sounding reference signal resource of theplurality of sounding reference signal resources, a frequency domainposition and frequency hopping information.
 15. The wirelesscommunication device of claim 11, wherein the PTRS port identifier thatcorresponds to each sounding reference signal resource is 0 or
 1. 16. Awireless communication device, comprising: a processor; and a memoryincluding processor executable code, wherein the processor executablecode upon execution by the processor configures the processor to:receive, from a base station, configuration information for a pluralityof sounding reference signal resources, wherein the configurationinformation comprises, for each sounding reference signal resource ofthe plurality of sounding reference signal resources, a phase trackingreference signal (PTRS) port identifier that corresponds to the soundingreference signal resource; receive a notification from the base stationindicating different sounding reference signal resource indications(SRIs) corresponding to different sounding reference signal resources ofthe sounding reference signal, wherein, in response to PTRS portidentifiers associated with the different SRIs being same, demodulationreference signal (DMRS) ports corresponding to the different SRIs areassociated with a same PTRS port; and perform an uplink transmissionbased on the different SRIs.
 17. The wireless communication device ofclaim 16, wherein the configuration information is carried in a RadioResource Configuration (RRC) signaling.
 18. The wireless communicationdevice of claim 16, wherein the different SRIs are indicated by aDownlink Control Information (DCI) message.
 19. The wirelesscommunication device of claim 16, wherein the configuration informationfurther comprises, for each sounding reference signal resource of theplurality of sounding reference signal resources, a frequency domainposition and frequency hopping information.
 20. The wirelesscommunication device of claim 16, wherein the PTRS port identifier thatcorresponds to each sounding reference signal resource is 0 or 1.